Question

1.How many different types of gametes with respect to the R and B genes can an individual with the genotype Rr bb produce, assuming R and B are separate unlinked genes?

	a.	1.
	b.	2.
	c.	3.
	d.	4.
	e.	None of the above.

2.In humans, which of the following statements of sex determination is true?

	a.	In humans, XX is female, XY is male.
	b.	In humans, XX is male and XY is female.
	c.	In humans, X0 is female and XX is male.
	d.	In humans, ZX is male and ZZ is female.
	e.	In humans, XXY is female and X0 is male.

3.Normal sperm of the frog Xenopus laevus have 5 chromosomes. How many total chromosomes does a normal Xenopus liver cell have?

	a.	1.
	b.	2.
	c.	5.
	d.	10.
	e.	20.

4.How many different types of gametes with respect to the R and B genes can an individual with the genotype Rr bb produce, assuming R and B are separate unlinked genes?

	a.	1.
	b.	2.
	c.	3.
	d.	4.
	e.	None of the above.

5.In the plant Xynomoga, the gene for flower petal color has 2 alleles, B which is dominant and produces blue petals; and b which produces white petals. The leaf shape of Xynomoga also has 2 alleles, R, which is dominant, produces round leaves; and r for square leaves. If a plant with the genotype BBRR is crossed with a plant that is bbrr, the F1 plants all show blue petals and round leaves. However, when these plants are selfed (crossed back to themselves) to generate an F2 generation, three fourths of the plants produced have blue petals and round leaves and one fourth of the plants show white petals and square leaves. Which of the statements is true below.

	a.	B and R are linked.
	b.	B and R both show incomplete dominance.
	c.	B is dominant to R.
	d.	B is recessive to R.
	e.	B and R are merozoically dominant.

6.Albinism is an autosomal recessive trait. If an albino man and an albino woman have children, what percentage of their children will be albino?

	a.	0%.
	b.	25%.
	c.	50%.
	d.	75%.
	e.	100%.

7.In the plant Arabidopsis majus (snap cress), red flower color is dominant to blue flower color. If a true-breeding red-flowered plant is crossed with a true breeding blue-flowered plant, what percentage of the F1 generation plants will have red flowers?

	a.	0%.
	b.	25%.
	c.	50%.
	d.	75%.
	e.	100%.

8.If the F1 generation plants from question 19 above are crossed to themselves (selfed), what percentage of the F2 plants will have red flowers?

	a.	0%.
	b.	25%.
	c.	50%.
	d.	75%.
	e.	100%.

Answer 1