Question

Question 1a)

In a male mouse, we are following 10 genes using a new molecular method to determine if gene pairs are homozygous or heterozygous in sperm cells.

How many different sperm cells may be formed if six of the ten gene pairs are homozygous and the remaining four gene pairs are heterozygous in the male parent?

	a.	20
	b.	32
	c.	60
	d.	64
	e.	1024

Question 1b)

You set up a cross of a pure line of gerbils with the genotype Q/Q; t/t to a pure line with genotype q/q; T/T.

The F₁ progeny include both male and female gerbils. You mate them to each other to observe the F₂.

Of the F₂ individuals, what proportion would be the result of a recombinant sperm fertilizing a recombinant egg?

	a.	1/16
	b.	2/16
	c.	4/16
	d.	6/16
	e.	10/16

Question 1c)

A parakeet has the genotype f/f; G/g. This parakeet is mated with a parakeet that has the genotype is F/f; G/g.

Assume that there is independent assortment of genes in parakeet.

What proportion of the parakeet progeny can we expect to be heterozygous for at least one of the genes?

	a.	1/8
	b.	2/8
	c.	4/8
	d.	5/8
	e.	6/8

Answer 1

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