Laboratory Review Questions Lab #10-Genetics You MUST SHOW WORK for each of the

Question

Laboratory Review Questions Lab #10-Genetics You MUST SHOW WORK for each of the following genetics problems. A key and Punnett square must be provided for each. #1 & #2 In humans, albinism (absence of skin pigmentation) is inherited as a recessive trait. If a heterozygous male has children with an albino female: 1. What is the probability that their first child will exhibit pigmentation? 2. What is the phenotypic ratio of pigmented children to albino children? #3 . #5 In humans, hemophilia is inherited as a sex-linked recessive trait on the X chromosome. If a carrier female has children with a normal male: 3. What is the probability that a child with hemophilia will appear in the offspring? 10-9

Explanation / Answer

Solution # 1-2

Genotype for albinism "aa"

the male is heterozygous male "Aa"

the female is albino "aa"

"aa" genotype will be albino

"Aa" genotype will have pigmentation

1. here 1st child to be pigmented skin is 2/4=1/2 = 50%

2. phenotypic ratio of pigmented to albino is 2:2 = 1:1

Solution # 3-5

Carrier female x normal male

XXh x XY

3. 1/4

4. 1/2

5. 0%

Solution # 6-7

6. So Mr. clay blood type = B

So Mrs. clay blood type = A

and Mikalo clay blood type = O

7. Yes

Explanation:

Let blood group B (Mr. Clay) is heterozygous so genotype is IBi

Let blood group A (Mrs. Clay)is heterozygous so genotype is IAi

Solution # 8

Karyotype is the arrangement of chromosomes according to their shape, size and legth. It is studied at metaphase, because during this phase chromosome struchres are clearly visible and chromatins are at maximum condensed state. Largest to smallest with sex chromosomes at the end.

Solution # 9

A a a Aa aa a Aa aa

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