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In chickens, a rose shaped comb is specified by an autosomal gene (R) which is dominant over its allele for single comb (r). A straight beak (B) is specified by a sex linked dominant gene; the recessive allele of which specifies a curved beak (b). A rose combed, curved beaked male, whose mother had a single comb, is mated with a single combed, straight beaked female.

a. What is the genotype of the male?

b. What is the probability that the first chick will be a rose combed, curved beaked female?

c. What is the probability that the first chick will be a single combed, curved beaked female?

d. What is the probability that the first chick will have a single comb?

e. What is the probability that the first two chicks will have single combs and straight beaks?

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Trinidad TremblayLv2
24 Jun 2019
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c.) A, AB

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e.) A, B, AB, O

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c.) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 50%.

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3. Hemophilia locus: Corneal dystrophy locus:

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Please show work. I want to learn how to do these problems.

1. The eye color of wild-type Drosophila flies is red. Differentmutations in a single or in multiple genes lead to flies with whiteeyes. Mutations in the w gene on the X chromosome lead to whiteeyes instead of the normal red. You have isolated both a white-eyedmutation (designated W-1) that gives a dominant phenotype, and awhite-eyed mutation (designated w-2) that gives a recessivephenotype.

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3. Describe in your own words what a balancer chromosome is andwhy it is important in fly genetics (you will have to do someresearch for this one!)

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