penotypic and genotypic ratio for YY and yy
Answers
Remember the information on recessives if you don't remember anything else. By knowing the recessive, you automatically know both the phenotype and genotype. In the monohybrid cross, a testcross of a heterozygous individual resulted in a 1:1 ratio. With the dihybrid cross, you should expect a 1:1:1:1 ratio!
Supplement. The genotypic ratio describes the number of times a genotype would appear in the offspring after a test cross. For example, a test cross between two organisms with same genotype, Rr, for a heterozygous dominant trait will result in offspring with genotypes: RR, Rr, and rr.
The phenotypic ratio from a dihybrid cross shows the ratio of two traits in the population. For example, let's say both parents are heterozygous dominant for fur that is black and smooth. ... If you count the number of different allele combinations in the Punnett square, the genotypic ratio is 1:2:2:1:4:1:2:2:1.