Shaded individuals in this pedigree have an Xlinked genetic

Shaded individuals in this pedigree have an X-linked genetic disorder that causes green toenails. Individuals who are not shaded have the normal clear toenails. Please answer the following questions regarding this pedigree. Assume that a capital \"G\" represents the dominant allele and that a lower case \"g\" represents the recessive allele.

1. Which allele is dominant? Green or Clear?

2. The pedigree identity numbers of the identical twins are:

a) III-1 and III-2

b) III-6 and III-7

3. The genotype of individual I-4 is

a) GG

b) Gg

c) gg

d) GY

e) gY

f) Cannot be determined

4. The genotype of individual II-6 is

a) GG

b) Gg

c) gg

d) GY

e) gY

f) Cannot be determined

5. What is the probability that the next child from the marriage of II-2 x II-3 will have be a son with green toenails?

a) 0

b) 1/8

c) 1/4

d) 3/8

e) 1/2

f) 5/8

g) 3/4

h) 7/8

i) 1

6. Supposed individuals III-1 and III-5 marry and have children. What is the probability that their first child will be a daughter with green toenails?

a) 0

b) 1/8

c) 1/4

d) 3/8

e) 1/2

f) 5/8

g) 3/4

h) 7/8

i) 1

Solution

1. The green character is dominant and clear is recesseive. Green - G and clear - g.

If the trait is recessieve, the female offspring from I-i and I-ii should be a carrier, but as the female exhiting the green phenotype which indicates that green is dominant phenotype.

2. Monozygotic twins are the identical twins so, the answer is b) III-6 and III-7.
The line indicates that the monozygotic twins.

3. As the recessieve character can only express her character in recessieve condition, so, the genotype of I-4 is c) gg

4. The male is in homozgyous recessieve in condition where as the female showing dominant condition (it may be either homo or heterozygous one)
As the offspring from those parents is exhibiting the trait which means the genotype of the II-6 is b) Gg.

ACCORDING TO CHEGG GUIDELINES WE HAVE TO ANSWER FIRST FOUR SUBPARTS OF THE QUESTION. POST THE REST AS SEPERATE QUESTIONS THEN I CAN HELP YOU.