Red is dominant over white. A homozygous red flower is crossed with a white flower. The F1 generation from this cross results in all heterozygous individuals. What will be the genotypic ratio of the F2 generation?
In the F1 generation, all individuals are heterozygous (Rr) because red (RR) is dominant over white (rr).
When the F1 individuals are crossed with each other, the following genotypic ratio can be expected in the F2 generation:
1 RR : 2 Rr : 1 rr
This ratio represents the distribution of possible genotypes in the offspring of two heterozygous individuals.
To determine the genotypic ratio of the F2 generation, we need to consider the possible genotypes resulting from the cross between two heterozygous individuals (Rr).
In this case, the genotypes of the F1 generation are all heterozygous (Rr), which means they carry one dominant allele (R) and one recessive allele (r).
When two heterozygous individuals (Rr) are crossed, the possible genotypes that can result are: RR, Rr, and rr.
Therefore, the genotypic ratio of the F2 generation from this cross will be:
1 RR : 2 Rr : 1 rr
This means that for every one individual with genotype RR, there will be two individuals with genotype Rr, and one individual with genotype rr.
To determine the genotypic ratio of the F2 generation, we need to understand the principles of Mendelian genetics and how traits are inherited.
In this scenario, we are considering the inheritance pattern of flower color, where red is a dominant trait and white is a recessive trait. The cross between a homozygous red flower (RR) and a white flower (rr) results in all heterozygous individuals (Rr) in the F1 generation.
Now, for the F2 generation, we need to consider the possible combinations of alleles from the F1 individuals during gamete formation. Each Rr individual can produce two types of gametes: one carrying the dominant allele (R) and the other carrying the recessive allele (r).
When we cross two heterozygous individuals (Rr x Rr), we can use a Punnett square to analyze the possible genotypes of the offspring.
The Punnett square would look like this:
R r
R RR Rr
r Rr rr
From the Punnett square, we can see that there are three possible genotypes: RR, Rr, and rr. The genotypic ratio will represent the number of individuals with each genotype.
In this case, the genotypic ratio for the F2 generation would be 1:2:1, indicating that there is a 1/4 chance of obtaining RR individuals, a 2/4 (or simplified, 1/2) chance of obtaining Rr individuals, and a 1/4 chance of obtaining rr individuals.
Therefore, the genotypic ratio of the F2 generation would be 1(RR):2(Rr):1(rr).