Question

In pea plants, the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). Describe the genotypes and phenotypes of pea plants that are homozygous dominant, homozygous recessive, and heterozygous for this trait.

Answer 1

Homozygous Dominant: YY

- A pure yellow pea pod

Homozygous Recessive: yy

- A pure green pea pod

Heterozygous: Yy

A yellow pea pod.

Recessive traits are only displayed when the genotype contains two recessive alleles.

Answer 2

Step-by-step explanation:

A dominant allele produces a character that is expressed (phenotypically) to the total exclusion of the other allele's character. This means the dominant allele overshadows the recessive allele.

Homozygous allele is having the exact same alleles of a particular gene. For instance, having two dominant or having two recessive alleles in a gene.

Heterozygous allele is having two different allele of a particular gene. Here, both dominant and recessive alleles are present in the gene.

Genotype is the genetic make up of an individual organism

Phenotype is the physical characteristics of an individual expressed as a result of genotype.

From the above explanation. it can be deduced that

1) Homozygous dominant:

Genotype: YY

Phenotype: The pea plant is yellow because both alleles are expressed for yellow colour in the plant

2) Homozygous recessive:

Genotype: yy

Phenotype: The pea plant is green because both alleles are expressed for green colour in the plant

3) Heterozygous:

Genotype: Yy

Phenotype: The pea plant is yellow because the dominant allele here is Y which is the allele expressed for yellow colour