A dominant gene (H) produces wire-haired texture in dogs: its recessive allele (

Question

A dominant gene (H) produces wire-haired texture in dogs: its recessive allele (h) produces smooth hair. A heterozygous female dog is mated with a smooth-haired male dog. What phenotypes are expected in a large number of puppies, and in what ratios? Marion has a baby boy named Ralph. She also claims that Mr. Smith is Ralph's father. Marion is blood type B: Ralph is blood type B: and Mr. Smith is blood type A. A) Is it possible that Mr. Smith is the dad? B) If so, what are Ralph's and Mr. Smith's genotypes? A baby has blood type B, Rh+, and the mom has blood type O, Rh-. Is it possible for a man of blood type AB, Rh- to be the father? Red-green colorblindness is inherited as an X-linked recessive. If a woman is colorblind, but the father of her children is not, what are the chances that her sons will be colorblind?

Explanation / Answer

Answer:

5). Heterozygous wire-haired dog(Hh) x smooth-haired dog (hh)-------Parents

                                         

h

H

Hh

h

hh

Heterozygous wire-haired dog(Hh) : smooth-haired dog (hh) = 1 : 1

6).

     Blood type, B genotypes= IBIB or IBi

Marion (IBi) x Ralph (IBi)-----Parents

IB

i

IB

IBIB(B)

IBi (B)

i

IBi (B)

Ii (O)

A) Mr. Smith is not the dad for Ralph, because only blood type B & O is possible from the parents but not blood type A.

B).

Ralph’s genotype (blood type A): IAIA or IAi

Mr. Smith’s genotype (blood type B): IBIB or IBi

7).

Blood type B, Rh+ genotype = IBi; Rh+ Rh-

Blood type O, Rh- genotype = ii, Rh- Rh-

Blood type AB, Rh- genotype = IBIB, Rh- Rh-

AB, Rh- x O, Rh-

i Rh-

IA Rh-

IAi: Rh- Rh-    (A, Rh-) (50o%)

IB Rh-

IBi: Rh- Rh-    (B, Rh-) (5o%)

No, blood type B, Rh+ is not possible, but B, Rh- is possible.

h

H

Hh

h

hh

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