Genetics Quiz

For each of the genotypes below determine what phenotypes would be possible. Purple flowers are dominant to white

For each phenotype below, list the genotypes (remember to use the letter of the dominant trait) Straight hair is dominant to curly

A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall?

• 0%

• 25%

• 50%

• 100%

Show the cross of a Tt plant and a Tt plant. What percentage of the offspring will be short? What percentage is tall?

• 25% short, 75% tall

• 50% short, 50% tall

• 75% short, 25% tall

• 100% tall

A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)?

• 25%

• 50%

• 75%

• 100%

A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? What percentage of the offspring will also be homozygous? What is the genotype of all of the offspring?

In pea plants purple flowers are dominant to white flowers. Two white flowered plants are crossed. What percentage of their offspring will have white flowers?

• 0%

• 25%

• 50%

• 100%

A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers?

• 0%

• 25%

• 50%

• 75%

Two plants, both heterozygous for the gene that controls flower color are crossed. What percentage of their offspring will have purple flowers? What percentage will have white flowers?

• 75% purple, 25% white

• 50% purple, 50% white

• 25% purple, 75% white

• 100% purple, 0% white

In guinea pigs, the allele for short hair is dominant. What percentage of the offspring will have short hair when two heterozygous guinea pigs are crossed?

• 25%

• 50%

• 75%

• 100%