Genetics Review

No freckles (FF, Ff) is dominant to freckles (ff). Give the phenotype for the following alleles: Ff

• homozygous dominant non-freckled

• homozygous recessive freckled

• heterozygous non-freckled

• heterozygous freckled

Look at the Punnett square below. What percentage of the offspring will have black fur?

• 100%

• 25%

• 75%

• 50%

Using the Punnett square below, identify the genotypes of the parents to produce approximately 50% homozygous brown-eyed offspring and 50% heterozygous offspring. R=dominant (red eye), r=recessive (brown eye)

• RR X RR

• Rr X Rr

• Rr X rr

• RR X rr

Using "A" to represent the dominant trait and "a" to represent the recessive trait, what are the genotypes of mom and dad in the F1 generation? Hint: 25% of the offspring is recessive for short wings.

• Mom: AA, Dad: AA

• Mom: Aa, Dad: aa

• Mom: aa, Dad: aa

• Mom: Aa, Dad: Aa

In pea plants, the allele for having a round seed shape (R) is dominant to having a wrinkled seed shape (r). A homozygous dominant pea plant for having a round seed shape and a pea plant that is heterozygous are crossed. What are the possible phenotypes of the offspring?

• All offspring will have round seeds.

• Some offspring will have round seeds, and some will have wrinkled seeds.

• All offspring will have wrinkled seeds.

• None of the above.

How many chromosomes are in each human sex cell?

• 20

• 46

• 23

• 78

A __________ is created during fertilization when two ________ or gamete cells unite as one.

• haploid; diploid

• zygote; haploid

• zygote; diploid

• diploid; haploid

All new daughter cells that are created through meiosis are __________ from their parent cells.

• clones

• identical

• different

• mutated

The mathematical chance that something will happen is known as _________________ .

• possibility

• probability

• percentage

• product

During the cell cycle, if a cell is damaged and doesn't pass its checkpoints, what will happen?

• It will undergo apoptosis (commits cellular suicide).

• Continue to complete its cell cycle.

• It will begin cell division.

• It will restart the cell cycle and try again.