Biology

Biology

Start

1. Which diagram represents the changes that happen to cell's chromosomes during the cell cycle?

Mitosis is the process of cell division in eukaryotic cells, where one cell divides into two genetically identical daughter cells.

Cell Cycle

2. A mouse skin cell containing (40) chromosomes undergoes mitosis. This process results in the formation of

A. two daughter nuclei, each with (40) chromosomesB. two daughter nuclei, each with  (20) chromosomes C. four daughter nuclei, each with (20) chromosomes  D. four daughter nuclei, each with (40) chromosomes

A botanist is studying the genetics of a particular species of plant. She knows that one plant may contain hundreds of individual seeds, each of which is the result of a separate fertilization event. She determines that seed color is controlled by a single gene with two alleles. The dominant allele results in black seeds, and the recessive allele results in brown seeds. In a follow-up experiment, the botanist crosses a homozygous dominant plant with a heterozygous plant.

3. Which of the following is the best prediction for the frequency of brown seeds that would result from this cross?

A. 0.00B. 0.25 C. 0.50 D. 1.00

In a population of fish, the gene that determines the scale color phenotype has two alleles. The allele for grey scales (S) is dominant to the allele for gold scales (s). In the same population of fish, the gene for fin length also has two alleles. The allele for normal fin length (F) is dominant to the allele for long fin length (f). A fish that is homozygous dominant for scale color and homozygous recessive for fin length is crossed with a fish that is heterozygous for scale color and homozygous dominant for fin length.

4. What are the possible genotypes of the offspring of this cross?

A. SsFFB. SSFf C. ssFF D. SsFf