Probability of Inheritance

Purple flowers are dominant over white flowers. A heterozygous purple flower is crossed with another heterozygous purple flower. The ratio of purple to white would be .

3:1

In pea plants, tallness (T) is dominant to shortness (t). What is the predicted genotypic ratio of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?

50 percent Tt, 50 percent tt

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. The Punnett square below examines the chance of offspring having freckles, which is a dominant trait. mc019-1.jpg Based on the Punnett square, what is the probability that the offspring will have freckles?

75 percent

Mendel crossed two plants that were heterozygous for purple flower color. Which genotypes could he have used to represent the cross?

Pp ´ Pp

The offspring of a particular cross are 100 percent heterozygous for tallness. What were the most likely genotypes of the parents?

TT ´ tt

Gregor Mendel crossed homozygous tall plants (TT) with homozygous short plants (tt). All the resulting offspring were tall. From these results, what conclusion did Mendel draw?

Tallness is a dominant trait.

The image shows a white sweet pea that is labeled with its two alleles for petal color. mc020-1.jpg What can you surmise from the labeled image?

White petal color is a recessive trait.

Which term describes an organism that has identical alleles for a trait?

homozygous

The image shows a purple sweet pea that is labeled with its two alleles for petal color. mc021-1.jpg Which is the genotype of the sweet pea?

homozygous dominant

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h). mc016-1.jpg Based on the Punnett square, what is the phenotype of the offspring?

tall