8. Suppose a primary oocyte undergoes nondisjuction during meiosis I. If the resulting gametes are crossed...
8. Suppose a primary oocyte undergoes nondisjuction during meiosis I. If the resulting gametes are crossed with normal sperm. What would be the frequency of males to females expected? a. 1 female : 1 male
b. 2 females : 1 male
c. 1 female : 2 males
d. 1 female : 3 males
e. 3 females : 1 male
Homework Answers
The gametes resulting from nondisjuction during meiosis I of a primary oocyte and normal sperm can result in 4 progenies with two 2n-1 chromosome and two 2n + 1 chromosome.
Non disjunction can result gametes with n+1 or n-1 chromosome. and normal sperm having n chromosome.
2n-1 - monosomy condition
2n+1 - trisomy condition
Parents - gametes XX , O - From female X, Y - Male
Progenies XXX(female) , XXY(male), XO(female) , OY(don't exist)
So answer b) 2 females:1male
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