Chapter 10 Biology Review

Of the following species used in agriculture, which is most likely a polyploid?

• cow
• goat
• wheat
• hen

If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous? 

• 0
• 75
• 50
• 100

A heterozygous organism is best described as which of these?

• dominant
• hybrid
• genotype
• true-breeding

What is the role of the spindle fibers?

• to move chromosomes in the cell
• to join homologous chromosomes together
• to store nucleotides prior to DNA synthesis
• to initiate the formation of the nuclear membrane 

Which event during meiosis leads to a reduction in the chromosome number from 2n to n?

• pairs of homologous chromosomes line up at the equator
• DNA undergoes replication
• homologous chromosomes travel to opposite sides of the cell
• sister chromatids are pulled apart at the centromere

The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?

• 23
• 46
• 45
• 92

Crossing over would most likely occur during which stage of the cell cycle?

• when DNA is being replicated
• when homologous chromosomes line up in pairs
• when centromeres are separated
• when cytokinesis begins 

During which phase of meiosis do homologous pairs of chromosomes line up next to one another along the equator?

• anaphase 1
• metaphase 1
• prophase 2
• metaphase 2 

Which stage of meiosis is responsible for the law of independent assortment?

• metaphase 1
• prophase 1
• telophase 1
• metaphase 2 

In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink and 8 offspring are produced, how many would be expected to be silver-blue? 

• 0
• 3
• 6
• 8