1nondisjunction can occur at either the first or second divi

1.nondisjunction can occur at either the first or second division of meiosis, XYY individuals could arise from nondisjunction at the ___ meiotic division in the __.

a.first, mother

b.second, mother

c.first, father

d.second, father

e.more than one of the above could give rise to XYY individuals

2.How does Tryptophan function in attenuation of the trp operon?

a.trypophan binds to the repressor preventing it from binding to DNA thus allowing transcription of the operon.

b.tryptohan binds to the stem-loop structures and prevents transcription

c.an abundance of tRNAs charged with tryptophan cause ribosome stalling

d.the lack of tRNAs charged with tryptophan allows stem-loop structures to form that enables transcription to continue

Solution

Ans 1 d second, father

XYY genotype occurs when the child gets the extra copy of Y from his father due to nom disjunction of chromosome in Anaphase II of meiosis. As only father possess Y chromosome, so it cannot come through mother.