Unit 4: Cell Replication.1

What are homologous chromosomes?

• Pairs of matching chromosomes that carry the same genes

• Chromosomes that are only found in haploid cells

• Pairs of chromosomes that carry different genes

• Single chromosomes that carry genes for traits

What initiates cell division in eukaryotic cells?

• The division of mitochondria

• The division of the nucleus

• The division of the cytoplasm

• The division of the cell membrane

What is a karyotype?

• A single strand of DNA

• A type of cell division

• A type of chromosome mutation

• A pictorial display of a species' chromosomes

What are chromatids?

• The two identical parts of the chromosome after the S phase

• Different types of chromosomes in a cell

• The point where two chromosomes touch

• Specialized regions where chromosomes are joined

Cells that carry homologous chromosomes are said to be:

• Diploid

• Aneuploid

• Polyploid

• Haploid

How many pairs of homologous chromosomes do humans have?

• 23 pairs

• 46 pairs

• 22 pairs

• 44 pairs

What is the diploid number for humans?

• 22

• 44

• 46

• 23

What is aneuploidy?

• Cells with double the number of chromosomes

• Cells with half the number of chromosomes

• A normal number of chromosomes in a cell

• The presence of an abnormal number of chromosomes in a cell

During which phase do cells spend 90% of their life?

• Mitosis

• Prophase

• Interphase

• Cytokinesis

What is crossing over?

• The process of cell division

• The replication of DNA

• The exchange of chromosome segments between non-sister chromatids

• The division of the cell nucleus