Question

In: Biology

1. Of the following events, which occurs last during meiosis and the preceding interphase in a...

1. Of the following events, which occurs last during meiosis and the preceding interphase in a male?

a)	The X and Y chromosomes replicate

b)	The X and Y chromosomes pair

c)	The X and Y chromosomes separate

d)	The Y sisters separate

2.

Of the following events, which occurs first during meiosis and the preceding interphase in a male?

Question 10 options:

a)	The Y sisters separate

b)	The X and Y chromosomes separate

c)	The X and Y chromosomes pair

d)	The X and Y chromosomes replicate

3.

An XYY individual could result from non-disjunction in

Question 11 options:

a)	Meiosis 1 of that individual's Mother

b)	Meiosis 2 of that individual's mother

c)	Meiosis 2 of that individual's father

d)	Meiosis 1 of that individual's father

4.

An XXY individual could not result from non-disjunction in

Question 12 options:

a)	Meiosis 1 of that individual's father

b)	Meiosis 2 of that individual's father

c)	Meiosis 1 of that individual's Mother

d)	Meiosis 2 of that individual's mother

e)	It could result from any of the above

Expert Solution

1. events, which occurs last during meiosis and the preceding interphase in a male is

Ans - d) The Y sisters separate

Separation of Y sister chromatids is the last event that happen during meiosis Ii prior to interphase.

2. events, which occurs first during meiosis and the preceding interphase in a male is

Ans - c) The X and Y chromosome pair

Preceding interphase the 1st step to occur in meiosis in males is tha pairing of X and Y chromosomes. During prophase I they pair and later separate at telophase I.

3. An XYY individual could result from non-disjunction in

Ans - c) Meiosis 2 of that individual's father

As it contain two Y chromosome the non disjunction must have taken place in the father. Gete with double Y chromosome will be produced if there is any non disjunction in meiosis 2.

4. An XXY individual could not result from non-disjunction in

Ans - b) Meiosis 2 of that individual's father

Non disjunction in meiosis 2 of father will produce two types of gametes XX or YY. They will give rise to either XXX or XYY when mated with normal egg. So XXY can never be produced in this case.

gladiator answered 4 months ago

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