Bell peppers ( Capsicum annum ) that you buy in the supermarket come in a variet

Question

Bell peppers (Capsicum annum) that you buy in the supermarket come in a variety of colors, Red, Green, Brown and Yellow. If true breeding Red are crossed with Green ones, all the F1s are Red. If the F1s are selved the offspring produced are Red, Brown, Yellow and Green peppers in a ratio of 9:3:3:1. Also crosses of F1s with the true breeding Green ones result in Red, Brown, Yellow and Green peppers in a ratio of 1:1:1:1.   Explain the likely genetic basis of these results in terms of the number of genes and their alleles.

Explanation / Answer

If true breeding Red are crossed with Green ones then all the F1 progeny is Red which shows that if there are two plants with alleles Rr and Gg where Rr is red and true breeding then then alleles R will be dominant over G and which is Green and true breeding so all the F1 progeny will be Red.

If the heterozygotes RrGg are crossed among then that is if the cross is RrGg x RrGg then we will have a 4 x 4

punnet square where we will get 9 Red (RrGg) , 3 Brown(Rrgg) , 3 Yellow(rrGg) and 1 Green (rrgg)

So, phenotypic ratio of Red : Brown : Yellow : Green = 9 : 3 : 3 : 1

Now,

RrGg is crossed with Gg then we will get four types of alleles in equal number that is we will get the ratio of Red:Brown:Yellow:Green = 1:1:1:1 because there will be one Red (RrGg) , one Brown (Rrgg) , one Yellow (rrGg) and one Green (rrgg)

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