Meiosis Review

When does crossing over occur?

• Interphase
• Prophase 1
• Prophase 2
• Metaphase 1

If a stem cell (body cell) has 24 chromosomes, how many will it have at the end of meiosis?

• 24

• 12

• 6

• the number varies per species

Meiosis results in ______.

• 4 genetically unique haploid gametes

• 4 genetically unique diploid cells

• 2 genetically identical cells

• 4 genetically identical cells

The chromosomes that pair up during meiosis, are called __________ chromosomes.  

• homozygous 
• asexual
• homologous
• genes

When homologous chromosomes match up, they form a structure call a ___________.

• tetrad
• triad
• diploid
• gamete

Two processes that increase genetic variation during meiosis are crossing over and _____

• Synapsis

• Tetrad

• Independent assortment

• Gameiosis

Human eggs and sperm are _____, and each has ____ chromosomes.

• diploid, 23
• diploid, 46
• haploid, 23
• haploid, 46

A male shark has 40 chromosomes in each of its sex cells. How many would be present in its body cells?

• 20
• 40
• 80
• 160

What is one of the advantages of reproducing sexually versus asexually?

• underproduction of offspring

• overproduction of offspring

• genetic variation

• artificial selection

Identify the phase.

• Telophase I
• Telophase II
• Metaphase I
• Metaphase II