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Probability of Inheritance

Terms in this set (10)

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
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. 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
Mendel crossed two plants that were heterozygous for purple flower color. Which genotypes could he have used to represent the cross?
Pp ´ Pp
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.
The offspring of a particular cross are 100 percent heterozygous for tallness. What were the most likely genotypes of the parents?
TT ´ tt
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
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.
Which term describes an organism that has identical alleles for a trait?
homozygous
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
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