Genetics EOC Review

Which of the following is a phenotype?

• Aa

• red hair

• heterozygous

• DNA

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

• 0%
• 25%
• 50%
• 75%

The genetic information inside an individual.

• Homozygous
• Heterozygous
• Genotype
• Phenotype

Having two different alleles for a trait (example Hh):

• homozygous
• heterozygous
• dominant
• purebred

In guinea pigs Black fur (B) is dominant to white(b), cross Bb x bb and determine genotypic ratio for offspring

• 2:2

• 0:2:2

• 1:2:1

• 2:2:0

In pea plants Tall stems (T)are dominant to short stems (t) cross a homozygous tall plant with a homozygous recessive plant, what is the phenotypic ratio

• 4:0

• 2:2:0

• 0:4

• 0:2:2

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?

• 75% hairy stems: 25% hairless stems

• 100% hairy stems

• 100% hairless stems

• 50% hairy stems: 50% hairless stems

A partial Punnett square is shown in the image.

Given the offspring in the Punnett Square, what is the most likely genotype of the parents?

• Both parents are heterozygous.

• Both parents are homozygous dominant.

• One parent is homozygous recessive and the other parent is heterozygous.

• One parent is homozygous dominant and the other parent is heterozygous.

Hawaiian happy face spiders can have different markings. The pattern allele is dominant to the plain allele. A plain spider is crossed with a homozygous patterned spider. What percentage of the offspring from this cross are expected to be patterned?

• 0%

• 25%

• 50%

• 100%

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds (Y)?

• RrYy

• RRyy

• RRYy

• rryy