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Life, 4/e

Ricki Lewis, University of New York at Albany
Mariëlle Hoefnagels, University of Oklahoma
Douglas Gaffin, University of Oklahoma
Bruce Parker, Utah Valley State College

Meiosis

Testing Your Knowledge

1. What is the evidence that sexual reproduction has been successful?

2. Distinguish among asexual reproduction, parthenogenesis, and sexual reproduction.

3. Describe how a plant life cycle may include a haploid and a diploid phase.

4. What are the two main events of a sexual life cycle?

5. Why is conjugation sexual but not reproductive?

6. Define the following terms:

a. crossing over

b. gamete

c. haploid

d. homolog

e. synapsis

f. diploid

7. How many sets of chromosomes are present in each of the following cell types?

a. an oogonium

b. a primary spermatocyte

c. a spermatid

d. a secondary oocyte

e. a polar body derived from a primary oocyte

8. How are the timetables different for oogenesis and spermatogenesis in humans?

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Additional Questions

1. Why must human gametes be haploid?

2. How does a human oocyte rid itself of excess genetic material? How does a human sperm shed excess cytoplasm?

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