Question

1. How do differences in genetics contribute to variations among individuals?

	a.	They transfer electrical impulses throughout the body.
	b.	They prevent bacteria from overtaking the immune system.
	c.	They work together with ghrelin to influence development.
	d.	They are responsible for the presence and expression of different traits.

2. If an individual gets a dominant gene for eye color from one parent, and a recessive gene from another, the ______.

	a.	recessive trait will be suppressed, and the dominant trait will be expressed.
	b.	gender of the child will determine if that trait is shown.
	c.	recessive trait will develop 50% of the time.
	d.	recessive trait will develop in the child.

3. Creation of reproductive cells males and females is  known as ______.

	a.	mitosis
	b.	autolysis
	c.	meiosis
	d.	catalysis

4. In the uterus the embryo and fetus develop within a protective_________.

	a.	embryonic disk
	b.	amniotic sac
	c.	umbilical cord
	d.	neural tube

5. Individuals with Down’s syndrome ______.

	a.	are unlikely to die from cardiovascular problems by middle age.
	b.	have no specific characteristic features.
	c.	show deficits in cognitive development.
	d.	are likely to have only 46 chromosomes.

6. Which of the following statements is true of a sperm cell?

	a.	A sperm cell is one of the smallest types of cells in the body.
	b.	A sperm cell travels randomly inside a woman’s reproductive tract.
	c.	A sperm cell is significantly larger than an egg cell.
	d.	A sperm cell contains two Y chromosomes.

7. Which of the following happens in the critical period that occurs in the third through fifth weeks of a pregnancy?

	a.	The development of arms and legs
	b.	The development of the stomach
	c.	The development of the lungs
	d.	The development of the heart

8. Which of the following statements is true of mutations?

	a.	Mutations help adenine combine with guanine to form the single spiral structure of deoxyribonucleic acid (DNA).
	b.	Mutations occur through radiation or other environmental influences.
	c.	Mutations produce sperm and ova cells.
	d.	Mutations can only occur by chance.

9. _________ is the process in which each pair of chromosomes splits so that one member of each pair moves to the new cell.

	a.	Mutation
	b.	Mitosis
	c.	Amniocentesis
	d.	Meiosis

Answer 1