Genetics Definition and 198 Threads

What are possible explanations as to why variation persists in the natural world despite the effects of genetic drift and directional selection?

This is a fairly taboo and controversial field. I've been hearing from many studies on intelligence, that it is highly heritable. Identical twins raised independent of each other have around a 0.75 relation in IQ tests. Siblings raised together have a .45 relation. What makes it worse is that...

A portion of an mRNA molecule has the sequence CCUAGGCUA. What is the sequence of the anti sense strand of the corresponding DNA molecule? The anti sense strand is the coding strand. The 3' to 5' strand from which mRNA builds. Does that mean the sequence would be backwards?

A probability problem (genetics), not homework, honest. 3 of 5 siblings are affected by an unknown inherited disease*. That this outcome is higher than 1 in 4 which is typically the case in recessive traits suggests that the disease is more likely to be dominant than recessive. Given 3...

Q: Which of the following mutagenic treatments would be least effective in creating a mutation in non-replicating cells? Explain your choice. a. Treatment with a deaminating agent like nitrous acid b. Treatment with an alkylating agent like MMS c. Treatment by exposure to UV d...

Homework Statement Mendel's explanation for the monohybrid crosses predicts that the phenotypic 3:1 ratio in the F2 can be explained by an underlying genotypic ratio of 1:2:1 (eg. 1PP:2Pp:1pp). How could you test to see if the purple flowered F2 were really in the ratio of 1PP:2Pp? Homework...

Do our genes have memory? Say that my grandfather was in finance, and my father was in finance, and i too am in finance, and have a keen interest in it, will my child have an edge in the field of finance, over the competition because 3 generation of people went into the same field...and...

I'm a biological engineering major planning on minoring in math/physics and computational neuroscience. I'm planning on taking a cell bio and neuroscience class as BIO SCI electives, but I'm wondering if genetics would be useful. Genetics is a prerequisite for cell bio but it isn't necessarily...

The following problem arises in the context of a paper on population genetics (Kimura 1962, p. 717). I have posted it here because its solution should demand only straightforward applications of tools from analysis and algebra. However, I cannot figure it out. Homework Statement Let z = 4...

I'm not too sure if this is the correct subforum to post this question in. Anyways I have taken Biochemistry only. I signed up to take molecular biology and I'm wondering if that is a bad idea with no previous coursework taken in genetics (the only biology college course I have taken is...

Homework Statement You decide to revert an iob- mutant to wild type (IOB+) using different mutagens and find the following reversion rates for each mutagen tested: 2-amino purine - 98% 5-bromouracil - 95% Nitrous acid - 94% Proflavin - 2% Spontaneous - 4% 1. What is the most likely...

Homework Statement A germ cell in the male part of a plant (anther) (n=2) produces 4 haploid pollen cells. Assume that the gene for flower color (F) is on chromosome 1 and the gene for leaf color (L) is on chromosome 2. If a plant contains two different alleles of the flower color gene (F...

QUESTION 1: Homework Statement 9. Your first cousin died of Tay-Sachs disease (autosomal recessive, incidence 0.09% (about 1 in 1100)). You are not affected, nor is anyone else in your extended family. What is the approximate chance that you are a carrier? A. 5.8% B. 12.5% C. 25% D. 50% E...

Hi, everyone, I was hoping if you can clear up some confusion for me. I have the questions and book answer to these homework problem. The hard part for me is understanding WHY these answer turn out to be the way it is. 1: Hardy-weinberg: Homework Statement 14.4 Consider a population that...

Do genetics and fossil record support the idea of genetic equidistance with respect to molecular clock, or is it mostly theoretical and inferred?

Hello, this will be my first post- so, apologies if I've accidently broken any forum rules. Anyway, my question is this: Should I major in Genetics or Biochemistry? As of now, I'm leaning toward biochem (I would love either major- biochem just covers more of my interests). However, my...

There is one part that I can't figure out the answer to on my genetics homework which is finding out what genotype will give 3:1 . I've tried using so ways but I really think getting those ratios is impossible; I honestly don't see any way but I really don't want to right that down. I was at...

Iam really interested in molecular biology and microbial genetics, did masters in microbiology and want to get into doctoral program and do serious research in my interesting field. Is it not the good reason to get into phd.

I was born with a myriad of mental issues ranging from psychosocial-immaturity, ADHD, sensitivity to noise and various other factors that correlate closely with Asperger's syndrome. My dad is PhD in Physics with a focus in cryogenics and my mom is a French existentialist artist (weird childhood...

A stab at any of my questions would be much appreciated. I've been mulling over the idea of pursuing a Ph. D.in Molecular Biology, genetics or something akin. I've missed the application deadlines for next year. However is it still possible to take classes towards the Ph. D. over next...

Q. A certain gene is necessary for certain protein synthesis in human beings. A new kind of test can detect the gene in people who have the gene 99.9% of the time, and falsely detects the gene 10.3% of the time when a person does not carry the gene. 93% of the population carries the gene...

Homework Statement Color-blindness in humans is a sex-linked recessive trait. A color-blind man marries a woman who has normal vision and they have four children, one girl and three boys. The man has a sister who sees normally and a brother who is also color-blind, but their father (the...

Each bone evolves independantly of the others, right? I'm pretty sure that each bone has it's own gene. Assuming I'm correct, my primary question is, did each bone also evolve its density or is there a single gene that controls the density of all bones, collectively? I hope my question is clear.

Homework Statement A portion of DNA has the sequence 3' TTGACGC 5'. The sequence of RNA that is transcribed from this sequence is Choose one answer. a. 3' UUCAGCG 5' b. 5' AACUGCG 3' c. 5' AACTGCG 3' d. 5' GCGUCAA 3' Homework Equations 3' TTGACGC 5' 5'...

Homework Statement Two homozygous plants are crossed and all offspring (F1) are yellow with long stems. A cross of the offspring (F1)produces the following phenotypes in the F2 generation: 1,263 yellow, long stem 1,196 white, short stem 205 yellow, short stem 195 white, long stem...

1. Homework Statement Height is a characteristic resulting from polygenic inheritance. If genes at four loci code for height, what is the probability that parents with the genotypes RrSSTtUu and RrSsTtUU will have a child possessing 8 tall alleles? Choose one answer. a. 1/128 b...

1. Homework Statement A colorblind man with blood type AB marries a woman with normal vision and blood type A who is heterozygous for both traits. What are the odds of having a daughter that is colorblind and has blood type A? 2. Homework Equations Xc Y IA IB x XC Xc IA i 3...

[b]1. Homework Statement Crossing an individual who is homozygous dominant for a trait with an individual whose genotype is unknown will most likely produce which set of offspring? [b]2. Homework Equations DD x ? DD x Dd DD x DD DD x dd [b]3. The Attempt at a Solution...

[b]1. Homework Statement In an organism, two separate genes influence the length of the hair. The allele for long hair, L, dominates the allele for short hair, l. The allele for hair, H, dominates the hairless allele, h. In the cross between parents of genotype LlHh and llHh, what ratio of...

Hello, I want to study the inheritance of red eyes and white eyes in drosophila. I have mated red-eyed females with white eyed males. F1: All F1 females were white eyed and all F1 males were red-eyed. 19 white eyed females and 22 red eyed males. I have also crossed the females and males of...

I was struggling with interpreting the following pedigree diagram: http://img245.imageshack.us/img245/715/photoon20100411at2211.jpg I can see from the diagram that only females seem to be capable of transmitting the disease - not males - this lead me to believe it is X-linked. In...

Confused on 2 questions hereIf a recombination frequency between two genes is 1.5%, what is the distance between the genes in map units on the linkage map? a. Impossible to determine, because the interference is not known. b. 1.5 c. 3 d. 0.75 Recombination frequencies a. arise from completely...

A women who was rh (-ve) and her husband is rh(+ve) and also her three children are rh (+ve) with normal delivery.the blood group is o+ve how is this possible?? Found this question at http://doubtfire.improveyourrank.in/discussion/29/geneticsrh-factor/#Item_0

I'm working on a problem in multi-allele diffusion in population genetics and I have come to this PDE: 0 = (tp_1(1-p_1)-sp_2)\frac{\partial u}{\partial p_1}+(sp_2(1-p_2)-tp_1)\frac{\partial u}{\partial p_2} + \frac{p_1(1-p_1)}{2}\frac{\partial^2 u}{\partial p_1^2} +...

In the Chi-square test, my textbook says that degrees of freedom are the number of independent variables minus one ,df = n - 1 does this mean that that n is equal to the number of observed values from the equation aka the number of times I've added or the number of terms? sum [(O-E)^2]/E Is...

Homework Statement A cross between two plants that both have green flowers produces 80 offspring plants, of which 36 have green flowers, 23 have black flowers, and 21 have blue flowers. Color variation is due to inheritance at one locus. What is the genotype associated with each flower...

I was just reading some story about how Kathy Ireland is opposed to abortion because at the moment of conception they have a 'DNA Fingerprint'. Abortion issue aside, it got me to wonder: If I sequenced my mother and father's DNA and generated all the 2^23 permutations of chromosomes would my...

The following thought experiment popped into my head when I was driving from the shop; Consider one set of alleles which is responsible for one of your inherited characteristics.Now suppose that we could swap that set ,without damage or interference,with equivelent sets from one or a multiple...

I am in AP Biology and we have been given an assignment relating to human genetics. The statement is: "Humans are genetically different; yet genetically similar at the same time." Explain why this statement is true. I have been researching day and night for the past 2 days and although I have...

Homework Statement An individual with genotype AA Bb Cc DD Ee is testcrossed. Assuming independent assortment of all gene loci, what fraction of the progeny are expected to have genotype Aa Bb Cc Dd Ee? Homework Equations Crossing AA Bb Cc Dd Ee X aa bb cc dd ee The Attempt at a...

hi guys.do u think some habit learned by someone can be passsed on to his or her children?

okay so I was talking to my friend, and they used the wrong term for a while, or said that they used the wrong term, so now I'm not 100% sure whether it's endosomes or lysozymes, but I was wondering, what are the dangers to a person who is doing gene therapy on an animal using...

Homework Statement Compare and contrast the transfer of the F factor and the lambda phage during conjugation under the following conditions: a) Hfr(\lambda) x F- b) Hfr x F- (\lambda) c) Hfr(\lambda) x F-(\lambda) The Attempt at a Solution a) Hfr infects F- which is non-immune -->...

I need help with these: 1. Charles was married once before, & he and his first wife had a child who suffers from cystic fibrosis. His current wife Elaine's brother died of cystic fibrosis. What is the probability that Charles & Elaine will have a baby with cystic fibrosis? Let's say A=...

1. How could you find out whether blue eyes or brown eyes is dominant? 1. My thoughts: Would you just cross a blue-eyed individual and a brown-eyed indivdual and observe what's prevalent in their offspring? 2. Gary has 6 fingers on each hand & 6 toes on each foot. His wife Sandy and daughter...

Homework Statement Dolor and her cousin Largo have conceived a child. They are very concerned about the baby, because they have heard that children of close relatives have a higher incidence of birth defects and/or inherited recessive disorders. They know that their maternal grandmother was a...

Hi there, sorry this question may already have been answered, several times. I tried to use the search function but couldn't come across such a thread. Long story short, I was wondering what you think of the future in Genetics? I'd imagine each embryo will be genetically modified perhaps to...

I started Genetics a couple of weeks ago and it is like a bajillion times harder than Honors Genetics Bio. I would appreciate if someone could clarify somethings and help give me an explanation on how the addition and multiplication rule works. Furthermore, my teacher says that during the AP...

Homework Statement A shmoo is a hypothetical genetic organism. Suppose you learned that shmoos may have long, oval or round bodies and that matings of shmoos result in the following: long x oval produced 52 long and 48 oval long x round produced 99 oval oval x oval produced 24 long, 53...

The question: In dogs, dark coat colour is dominant over albino, and short hair is dominant over long hair. If these effects are caused by two independently segregating gene pairs, write the most probable genotypes for the parents of each of the following crosses: (Use the symbols D and d for...