Multiple Choice
In Mendel's experiments with pea plants, what did he observe about the traits of the offspring in the F1 generation compared to the parental (P) generation?
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2. Mendel's Laws of Inheritance
Mendel's Experiments and Laws
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Which of the following statements best explains the outcome of a monohybrid cross between two heterozygous pea plants (Yy × Yy) for seed color, where yellow (Y) is dominant over green (y)?
A
All offspring will have yellow seeds.
B
The offspring will exhibit a 1:2:1 ratio of yellow to green seeds.
C
Half of the offspring will have green seeds and half will have yellow seeds.
D
The offspring will exhibit a 3:1 ratio of yellow to green seeds.
Verified step by step guidance1
Identify the genotypes of the parent plants: both are heterozygous (Yy), meaning each has one dominant allele (Y) and one recessive allele (y).
Set up a Punnett square to determine the possible genotypes of the offspring by combining the alleles from each parent: the possible gametes are Y and y from each parent.
Fill in the Punnett square to find the genotypic combinations: YY, Yy, Yy, and yy.
Determine the phenotypes based on dominance: YY and Yy will show the dominant yellow seed color, while yy will show the recessive green seed color.
Calculate the phenotypic ratio by counting the number of yellow (YY and Yy) versus green (yy) offspring, which results in a 3:1 ratio of yellow to green seeds.
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