Mendel's experiments with pea plants demonstrated the law of dominance: traits are inherited as dominant and recessive alleles,
and the dominant allele for a trait can mask the presence of the recessive allele. Occasionally, that law is contradicted: offspring exhibit a blend of their parents' traits. For example a red flowering plant when crossed with a white flowering plant would produce a plant with pink flowers. In a genetic cross between a homozygous red flowering plant and a heterozygous pink flowering plant, predict the probability of having offspring with red flowers.
2 answers:
Answer:
The probability of the offspring of this crossing to be red is 50%.
Explanation:
As shown in the question above, heterozygous individuals have a pair of alleles formed by a recessive and a dominant allele. In this case, the characteristic of the dominant allele stands out and is expressed, while the recessive allele is inhibited. The only way for the recessive allele to have its characteristic expressed is if it pairs with another recessive allele.
If we cause a heterozygous red plant (Aa) to cross with a recessive white plant (aa), there is a 50% probability that this offspring will be red in color and be heterozygous. There will also be a 50% probability that this offspring will be white and homozygous.
You can see this in the punnet square added below.
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