The cross involves two gene having two alleles each.
Further Explanation:
Two <u>phenotypes</u> of parakeets was taken as the observation while breeding them. The phenotypes selected was:
- Yellow body (<u>Genotype</u> for the yellow body can be denoted as YY, Yy, yy).
- Patterned feather <u>(Genotype</u> for the patterned feather can be denoted as PP, Pp,pp).
As two traits has been selected so two genes would be involved for them and each gene has two alleles.
Four different offspring phenotype was observed after breeding. This could only be possible if the cross involved was a dihybrid cross.
The dihybrid cross involves two genes encoding two different traits. The dihybrid cross has the phenotypic ratio of 9:3:3:1. This ratio can be explained in the following manner:
1. 9 out of 16 has presence of atleast one allele in dominant form for both the genes. For example in this case it will be: Y_P_.
2. 3 out of 16 has presence of atleast one allele in dominant form for a gene and other gene will have recessive alleles. For example in this case it can be either Y_pp or yyP_.
3. 1 out of 16 has presence of both allele in recessive form of both the gene. For example in this case it will be yypp.
The phenotypic ratio can be calculated using the formula: .
Learn more:
1. Learn more about genetic code brainly.com/question/4037964
2. Learn more about RNA brainly.com/question/334927
3. Learn more about DNA brainly.com/question/2416343
Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Genetics
Keywords:
Genotype, cross, gene, allele, dihybrid cross, phenotypes, dominant form, recessive alleles, phenotypic ratio.