Biology-- Sexual Reproduction Review

A large number of sperm cells are produced by males every day. This large number of sperm cells increases the chance that

• (1) at least one sperm cell will be reached when the eggs swim toward the sperm cells in the ovary

• (2) several sperm cells will unite with an egg so the fertilized egg will develop properly

• (3) some of the sperm cells will survive to reach the egg

• (4) enough sperm cells will be present to transport the egg from where it is produced to where it develops into a fetus

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Which hormone does not directly regulate human reproductive cycles?

• testosterone

• insulin

• estrogen

• progesterone

A benefit of sexual reproduction is

• less energy is used

• greater genetic diversity in the species

• it is more efficient than asexual reproduction

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Why is greater genetic diversity important for a species?

• the species is more likely to survive disasters

• the population of the species will never get too large

• there will be less competition with other species

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) Which sequence represents the order of some events in human development?

• (1) zygote → sperm → tissues → egg

• fetus → tissues → zygote → egg

• zygote → tissues → organs → fetus

• sperm → zygote → organs → tissues

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German measles is a disease that can harm an embryo if the mother is infected in the early stages of pregnancy because the virus that causes German measles is able to

• be absorbed by the embryo from the mother’s milk

• be transported to the embryo in red blood cells

• pass across the placenta

• infect the eggs

identify one activity of a mother that can disrupt fetal development and explain how this activity might affect the development of her fetus.

Answer explanation

If a mother uses drugs or alcohol, these materials can diffuse through the placenta into the fetus, thus preventing the normal development

Which letter indicates the normal site of most prenatal development?

• A

• E

• D

• C

The sequence of diagrams represents some events in a reproductive process.

To regulate similar events in human reproduction, what adaptations are required?

• the presence of genes and chemicals in each cell in stages 1 to 7

• an increase in the number of genes in each cell in stages 3 to 5

• the removal of all enzymes from the cells in stage 7

• the elimination of mutations from cells after stage 5

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Tissues develop from a zygote as a direct result of the processes of

• fertilization and meiosis

• fertilization and differentiation

• mitosis and meiosis

• mitosis and differentiation

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