Answer the following questions based on the pedigree below W

Answer the following questions based on the pedigree below: What is the mode of inheritance for this trait? What is the genotype for individual 7? What is the genotype for individual 3? The genotype of FI individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring would have the following genotypes? aabbccdd AaBBccDd

Solution

Answer:

1).

A). It is X-linked recessive inheritance

B). X^aX^a

C). X^AY

2).

a). aabbccdd genotype probability = 1/256

Explanation:

Aa X Aa = AA(1/4), Aa(1/2) & aa (1/4)

Bb X Bb = BB(1/4), Bb (1/2) & bb(1/4)

Cc X Cc = CC (1/4), Cc(1/2) & cc (1/4)

Dd X Dd = DD (1/4), Dd (1/2) & dd (1/4)

aabbccdd= 1/4 *1/4 *1/4 *1/4 = 1/256

b). AaBBccDd = 1/2 * 1/4 *1/4 *1/2= 1/64