Table of Contents
What is the probability of an offspring having the YY genotype?
In another example (shown below), if the parent plants both have heterozygous (YG) genotypes, there will be 25% YY, 50% YG, and 25% GG offspring on average. These percentages are determined based on the fact that each of the 4 offspring boxes in a Punnett square is 25% (1 out of 4).
Is yy yy and yy a genotype or a phenotype?
YY is the homozygous dominant genotype (2 Y alleles). The phenotype of this genotype is yellow seed color. Yy is the heterozygous genotype (one dominant allele, one recessive allele). The phenotype of this genotype is yellow seed color….Mendelian genetics review.
| female\male (down\across) | y |
|---|---|
| Y | Yy |
How do you find the phenotypic ratio of a Dihybrid cross?
These nine genotypes can be grouped into four phenotypes, for example 1 YYRR + 2 YYRr + 2 YyRR + 4 YyRr = 9Y-R- round, yellow peas. The ratio of these phenotypes is of course 9:3:3:1. Mendel reported the results of some but not all of the “7 choose 2” = (7)(7-1)/(2) = 21 possible dihybrid crosses with seven characters.
Which is dominant in cross yy x yy?
In the cross Yy x Yy, what percent of offspring would have the same phenotype as the parents? In a certain plant, purple flowers are dominant to red flowers. If the cross of two purple-flowered plants produces some some purple-flowered and some red-flowered plants, what is the genotype of the parent plants?
How many offspring are heterozygous in a punnet square?
Now you have two letters in each box. Each box represents an offspring, and it’s genotype for a specific trait. So you can see here that 50% of the offspring have heterozygous genotype, 25% for both dominant and recessive. About 50%. A standard Punnet Square of Yy x Yy will result in YY, Yy, Yy, and yy.
How many offspring will a heterozygous plant have?
So you can see here that 50% of the offspring have heterozygous genotype, 25% for both dominant and recessive. About 50%. A standard Punnet Square of Yy x Yy will result in YY, Yy, Yy, and yy.
What happens if two heterozygous parents are crossed?
If heterozygous parents are crossed and the F1 offspring are test crossed, what will be the genotypic and phenotypic ratios of the F2 progeny? Because the parents were heterozygous, the F1 could be any of the three possibilities — AA, Aa, or aa. So the F2 won’t be easily predictable.