Punnett Square

A plant species has two alleles for leaf shape: Curly (C) and flat (c). The Curly (C) allele exhibits complete dominance. Based on the following Punnett Square, what is the probability that an offspring will be homozygous recessive?

A plant species has two alleles for flower color: Red (R) and White (r). The Red (R) allele exhibits incomplete dominance. The intermediate phenotype is pink flowers.

Based on the following Punnett Square, what is the probability that an offspring will be homozygous recessive?

A plant species has two alleles for stem length: Long (L) and Short (l). The Long (L) allele exhibits incomplete dominance. The intermediate phenotype is intermediate stems.

Based on the following Punnett Square, what is the probability that an offspring will be heterozygous?

A plant species has two alleles for seed shape: Flat (F) and round (f). The Flat (F) allele exhibits incomplete dominance. The intermediate phenotype is curved seeds.

Based on the following Punnett Square, what is the probability that an offspring will be homozygous recessive?

A plant species has two alleles for stem length: Long (L) and Short (l). The Long (L) allele exhibits incomplete dominance. The intermediate phenotype is intermediate stems.

Based on the following Punnett Square, what is the probability that an offspring will be homozygous recessive?

Imagine that you are a rabbit breeder with two purebred rabbits, a male with black fur and a female with tan fur. When you cross your rabbits, all of the F1 kits (baby rabbits) have tan fur.

Which trait is dominant, and which is recessive?

• Black fur is dominant, while tan fur is recessive.

• Tan fur is dominant, while black fur is recessive.

• Both tan fur and black fur are dominant.

• Neither tan fur nor black fur is dominant.

Which statement best describes the relationship between genotype and phenotype?

• Genotype always completely determines phenotype.

• Phenotype always completely determines genotype.

• Genotype determines phenotype, but with influence from the environment.

• Phenotype determines genotype, but with influence from the environment.

Many farmers prefer cattle without horns because it is safer for their herds. The allele for no horns (N) is dominant to the allele for the presence of horns (n).

A farmer mates a male with horns to a heterozygous female without horns.

What is the chance that the offspring will have horns?

• 4/4

• 0/4

• 3/4

• 1/2

In watermelons, solid green rind color (G) is dominant to stripes (g).

A farmer crosses two watermelon plants that are heterozygous for rind color.

What are the odds that the offspring will have solid green rinds?

• 4/4

• 0/4

• 3/4

• 1/4

In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a).

A mother with the genotype Aa and a father with the genotype Aa produce an offspring.

What is the percent chance that the offspring will have NO belly fur?

• 25%

• 100%

• 75%

• 50%