Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12, Problem 10TYK
A man is homozygous dominant for alleles at 10 different genes that assort independently. How many genotypically different types of sperm cells can he produce? A woman is homozygous recessive for the alleles of 8 of these 10 genes, but she is heterozygous for the other 2 genes. How many genotypically different types of eggs can she produce? What hypothesis can you suggest to describe the relationship between the number of different possible gametes and the number of heterozygous and homozygous genes that are present?
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In fruit flies, the allele for normal wings (V) is dominant to the allele for short wings (v). Suppose two fruit flies heterozygous for the trait are mated.
What is the male fruit fly’s genotype and the female fruit fly’s genotype?
What is the male fruit fly’s phenotype and the female fruit fly’s phenotype?
What will be the genotypic ratio of the F1 generation?
What will be the phenotypic ration of the F1 generation?
1. If one parent is Tt, what alleles can they pass on to an offspring? (we're talking about a parent producing a gamete,
right?)
2. If one parent is TT and the other parent is Tt, what are the possible offspring (These are zygotes, right?)
--This is where it gets confusing so make sure to read over Larsen's explanation, and my explanation in the lecture
video. The first two questions were super simple, but they were designed to orient your thinking for a dihybrid cross
3. If one parent is TtRr, what alleles can they pass on to an offspring? (what do their gametes look like in terms of
letters?)
4. Same as #3, but with different letters. If one parent is TTrr, what alleles can the pass on to an offspring?
In mice, there is an allele that in the heterozygous condition, produces mice with yellow coats. Mice that are homozygous recessive for the allele have white-color coats. Homozygous dominant mice abort early or are born stillborn. If a yellow male is mated to female yellow mouse, what is the phenotypic ratio you would expect among the 15 living offspring? (Show your work below.)
Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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- Suppose that a female who is colorblind mates with a male who is not For (a) and (b), make sure to define the alleles. What is the genotype of the female? What is the genotype of the male? What is the probability that a male child produced from this union is colorblind? What is the probability that a female child produced from this union is colorblind? Please show punnet square alsoarrow_forwardHuman sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?arrow_forwardHuman females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?arrow_forward
- Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. A female homozygous for an X-linked allele can produce how many types of gametes with respect to that allele? c. A female heterozygous for an X-linked allele can produce how many types of gametes with respect to that allele?arrow_forwardSkin color in humans is determined by a polygenic inheritance system, possibly involving as many as 9 genes. For simplicity let’s consider the influence of 2 genes: A and B, where the dominant allele darkens skin color. Suppose a woman who is AABb mates with a man who is Aabb. List all of the possible genotypes and the consequent ratios of the gametes that could be produced by the parents.arrow_forwardIn the USA the frequency of carriers for the devastating autosomal recessive trait of procrastination is 1/10 people. You do not procrastinate and want to have a child with another highly efficient non-procrastinator. You are worried that you both might be carriers and that your child would be a procrastinator. What is the probability that you are a carrier, AND your mate is a carrier, AND your child is procrastinator?arrow_forward
- A heterozygous free-lobed man is mated to a heterozygous free-lobed woman. What are the genotypes and phenotypes of their possible offspring?arrow_forwardAssume that long ear lobes in humans are an autosomal dominant trait that exhibits 30% penetrance. A person who is heterozygous for long ear lobes mates with a person who is homozygous for normal ear lobes. What is the probability that their first child will have long ear lobes?arrow_forwardThe probability that both alleles in the offspring are type A is the product of the probability that the allele from the pollen is A and the probability that the allele from the ovule is A (we will derive this in Section 6.5). What is the probability that the offspring of a homozygous parent is homozygous? What is the probability that the offspring of a homozygous parent is heterozygous?arrow_forward
- Black eye (B) is dominant over brown eye (b). A man that is a homozygous dominant black-eyed marries a woman that is a heterozygous black-eyed. The offspring resulted to 50% homozygous black and 50% heterozygous black. If one of their heterozygous children marries another heterozygous partner. Regardless of its gender, what are the genotypes of their children? a. 25% BB, 50% Bb, 25% bb b. 50% BB, 25% Bb, 25% bb c. 25% BB, 25% Bb, 50% bb d. 0% BB, 75% Bb, 25% bb In Law of Codominance, a pure line dominant trait crossed with a recessive trait will result to the appearance of both dominant and recessive trait in the offspring. What is the percentage of having a red-haired offspring if the parental genotype is both a heterozygous roan haired? Red hair is a dominant trait and white hair is a recessive trait. a. 100% b. 75% c. 50% d. 25% e. 0%arrow_forwardIn humans color vision is X-linked, the gene for color vision is located on the X chromosome but is absent on the Y chromosome. Normal color vision (XN) is dominant over colorblindness (Xn). Suppose a colorblind man fathers the children of a woman with genotype XNXN. What is the genotype of the father? What proportion of daughters will be colorblind? What proportion of the sons will be colorblind?arrow_forwardAssume that long ear lobes phenotype in humans is an autosomal dominant trait that exhibits 10% penetrance. A person who is heterozygous for long ear lobes mates with a person who is also heterozygous for long ear lobes. What is the probability that their first child will have long ear lobes.arrow_forward
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