A woman with normal vision whose father is color-blind marries a color-blind male. What is the probability that they will have a son that is color-blind? Show your work and explain your reasoning. You can cut and paste a table/punnett square into the Bb Learn submission box if it will help you explain your results?

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Collen VonLv2

28 Sep 2019

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. A recessive allele on the X chromosome is responsible for red-green color blindness in humans. This means that females have two copies (since human females are XX) and males have one copy (since human males are XY). This is called a sex-linked trait. A red-green color blind male is genotype Xn Y. A normal vision male is genotype XN Y. For this problem, a normal vision woman whose father is color-blind marries a color-blind male. N= not color blind allele, n = color blind allele. Y = Y chromosome.

a. What is the genotype of the color-blind father? Why?

b. What is the genotype of the color-blind husband? Why?

c. What is the genotype of the normal vision woman? Why?

d. What is the probability that this couple will have a son that is color-blind?

e. What is the probability that this couple will have a daughter that is color-blind?

1. A recessive alleleon the X chromosome is responsible for red-green color blindness inhumans. A woman with normal vision whose father is color-blindmarries a color-blind male. What is the probability that the couplewill have a color-blind offspring? Draw a Punnett square to show yourwork.

crimsonturtle112

1. If you had a fruitfly with phenotype A, what test would you make to determine if it was Aa or AA? Explain the different outcomes expected if the fly in question is AA or Aa.

2.The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans). Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female?

3.A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color-blind) marries a color-blind male. What is the likelihood that this couple's first son will be color-blind?

4. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that they will have a daughter with hemophilia? (Note: In this problem, you must include the probability of having a daughter in your computation of the final probability.)

5. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

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