Question

Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable phenotypes of the parents (P1)?

all white
all red
unable to determine
half red and half white

Answer 1

all red

Step-by-step explanation:

The 3:1 ratio in monohybrid inheritance can be represented in the form of probability. The red is dominant and therefore can be expressed in homozygous and heterozygous state. The parents were heterozygous red.

R r

R RR Rr

r Rr rr

F1 phenotypes is 3 red: 1 white

F1 genotype is 1RR: 2Rr: 1rr

Answer 2

all red

Explanation:

A punnet square can be described as a diagram which is made to depict the possible outcomes of a cross. Punnet squares are of utter importance in making genetic studies and genetic counselling.

To depict the phenotype of the parents, let's construct a punnet square which will give results in 3:1 ration.

R r

R RR Rr

r Rr rr

Hence, we can say that the P1 generation will be red as red is the dominant trait.