In this question, the offspring phenotypes have a ratio of roughly 1:1:1:1. Since there are F1 offspring that are homozygous recessive for both traits, the white-disk parent must have carried the recessive allele for each trait. The white-disk parent is heterozygous for each gene: WwDd.
What is the phenotypic ratio in F1 generation?
The phenotypic ratio is 9:3:3:1 whereas the genotypic ratio is 1:2:1:2:4:2:1:2:1.
What are the phenotypes of the F1 generation?
So, the F1 generation all have identical genotypes, heterozygous at the seed color gene, and their phenotypes are yellow seeds.
How do you find the ratio of phenotypes?
Write the amount of homozygous dominant (AA) and heterozygous (Aa) squares as one phenotypic group. Count the amount of homozygous recessive (aa) squares as another group. Write the result as a ratio of the two groups. A count of 3 from one group and 1 from the other would give a ratio of 3:1.
What is the phenotypic ratio of F1 and F2 generation?
Plants of F1 generation are allowed to interbreed freely among themselves to get F2 generation. In F2 generation, tall red, tall white, dwarf red and dwarf white will be in the ratio of 9:3:3:1. Thus F2 phenotypic ratio is 9:3:3:1.
What is the expected phenotypic ratio in the F1 generation of a true breeding Monohybrid cross?
A monohybrid cross results in a phenotypic ratio of 3:1 (dominant to recessive), and a genotypic ratio of 1:2:1 (homozygous dominant to heterozygous to homozygous recessive).
What shows a 3 1 ratio of phenotypes?
The F2 generation always produced a 3:1 ratio where the dominant trait is present three times as often as the recessive trait. Mendel coined two terms to describe the relationship of the two phenotypes based on the F1 and F2 phenotypes.
How many phenotypes are possible?
A fetus receives one of these three alleles from each of its parents. This produces four possible phenotypes (blood types) and six possible genotypes.
What is the ratio F1 F2?
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F2, whereas the ratio between the two frequencies is all the time maintained constant: F1 : F2 = 1 : 9.
What is the phenotypic ratio of F1 progeny and why?
The heterozygous condition has a phenotype different from either of the homozygous genotypes. The joint character may appear to be intermediate between the ones produced by the two homozygous genotypes. The phenotypic ratio of F1 progeny is found to be 1:2:1.