SB1b

DNA replication must occur

• before the nucleus divides
• immediately following sytokinesis
• during mitosis
• all of the above

During most of the cell's life, the chromosomes will be in the form of

• Chromatin
• Sister Chromatids
• Homologous Chromosomes
• Tetrads

Mitosis occurs in

• Eukaryotic cells
• Somatic cells
• Gametes
• Both Eukaryotic and Somatic cells

In meiosis, two successive divisions result in

• the formation of two identical cells
• four haploid cells
• a zygote
• identical haploid cells

DNA replication occurs during the ______ phase of __________________.

• prophase; mitosis
• G1; interphase
• G2; mitosis
• S; interphase

Which type of organisms carry out binary fission?

• animals
• fungi
• bacteria
• plants

Given that the diploid number of cattle is 60 (2n = 60), what is the haploid number of chromosomes in cattle?

• 60
• 20
• 30
• 50

What are some reasons why a cell needs to divide?

• Growth
• Replace
• Repair
• All of the above

Why does crossing over occur in meiosis but not mitosis?

• The goal of mitosis is to produce genetically unique cells, and crossing over ensures that all cells produced during meiosis are identical
• The goal of mitosis is to produce genetically identical cells, and crossing over ensures that all cells produced during meiosis are identical.
• The goal of meiosis is to produce genetically unique cells, and crossing over ensures that all cells produced during meiosis are unique.
• The goal of meiosis is to produce genetically identical cells, and crossing over ensures that all cells produced during meiosis are unique

In humans, each gamete receives

• one chromosome form each of the 23 pairs
• 23 pairs of chromosome from each parent
• 23 from mom, 23 from dad totaling 46 chromosomes
• 26 homologous chromosomes, 13 from mom, 13 from dad