Question

Pea plants can have yellow seeds or green seeds Which conclusion about the meaning of Y is correct if the allele

combination Yy is for yellow seeds?
O yellow and dominant
O green and recessive
O yellow and recessive
Ogreen and dominant
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Answer 1

The correct conclusion about the meaning of Y in pea plants is that it represents a yellow and dominant allele. For a dihybrid cross between RrYY and rrYy pea plants, you would need a 16-square Punnett square to analyze all the possible genotypes and phenotypes.

Step-by-step explanation:

If the allele combination Yy is for yellow seeds in pea plants, then the correct conclusion about the meaning of Y is that it represents a yellow and dominant allele. In genetics, a dominant allele is always expressed in the phenotype when present, while a recessive allele is only expressed when a dominant allele is not present. In this case, yellow seeds are dominant over green seeds, meaning that a plant will have yellow seeds if it has at least one Y allele. This is evident from the fact that the Yy combination results in a plant with yellow seeds, indicating that the presence of the Y allele is sufficient to produce the yellow seed phenotype.

For the given cross between RrYY and rrYy pea plants, there is a dihybrid cross involving two traits: seed shape (R is round and dominant, r is wrinkled and recessive) and seed color (Y is yellow and dominant, y is green and recessive). The possible genotypes for this cross could involve combinations of these alleles, leading to different phenotypes in the offspring. To perform a Punnett square analysis for this dihybrid cross, you would need a 16-square Punnett square because each parent can produce four different types of gametes (2 traits each with 2 alleles combine to form 2^2 = 4 gametes), and when these are crossed, you need a grid that allows for all possible combinations of those gametes (4 gametes from one parent × 4 gametes from other parent = 16 combinations).

Answer 2

yellow and dominant

Step-by-step explanation:

Gregor Mendel has stated that a gene comes with two alleles. According to his law of dominance, one of the alleles called DOMINANT allele is capable of masking the phenotypic expression of another allele called RECESSIVE allele.

In this question involving a seed color gene, which has two alleles Y and y. Y, which represents the dominant allele codes for the YELLOW trait while y, which represents the recessive allele codes for the GREEN trait. Therefore, a plant with Yy will have YELLOW SEEDS because the dominant allele (Y) is present.