CLEP CLEP Biology Cell Division: Mitosis and Meiosis 3

Question 1

Which of the following events occurs during meiosis but NOT during mitosis?

Accepted Answer

Synapsis of homologous chromosomes

Answer

Formation of a spindle apparatus

Answer

Condensation of chromosomes

Answer

Reformation of the nuclear envelope

Question 2

Independent assortment of chromosomes, which generates genetic diversity, occurs during:

Accepted Answer

Metaphase I of meiosis

Answer

Metaphase of mitosis

Answer

Prophase I of meiosis

Answer

Telophase II of meiosis

Question 3

At the end of meiosis I, what is the ploidy of the two resulting cells in a human?

Accepted Answer

Haploid (n = 23)

Answer

Diploid (2n = 46)

Answer

Tetraploid (4n = 92)

Answer

Triploid (3n = 69)

Question 4

Non-disjunction occurring during meiosis I results in gametes that are:

Accepted Answer

Either n+1 or n-1 for the affected chromosome

Answer

All normal (n)

Answer

Only n+1 for the affected chromosome

Answer

Unable to participate in fertilization

Question 5

Which of the following events contributes to genetic variation by creating new combinations of alleles on the same chromosome?

Accepted Answer

Crossing over during prophase I

Answer

Independent assortment

Answer

DNA replication in S phase

Answer

Cytokinesis

Question 6

In human males, spermatogenesis produces how many functional sperm from each primary spermatocyte that enters meiosis?

Accepted Answer

Four functional sperm

Answer

One functional sperm and three polar bodies

Answer

Two functional sperm

Answer

Eight functional sperm

Question 7

Trisomy 21 (Down syndrome) most commonly arises when a gamete with two copies of chromosome 21 is produced. This is caused by:

Accepted Answer

Non-disjunction of chromosome 21 during meiosis

Answer

Deletion of chromosome 21 during mitosis

Answer

Duplication of chromosome 21 in S phase

Answer

Inversion of chromosome 21 during prophase I