In a plant,three dominant genes A,B,and C mus | vedclass

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(A) The production of purple flowers requires the presence of at least one dominant allele for each of the three genes ($A$,$B$,and $C$). This is a ca

Vedclass · Accepted Answer

$\frac{27}{64}$

Vedclass · Answer

(A) The production of purple flowers requires the presence of at least one dominant allele for each of the three genes ($A$,$B$,and $C$). This is a case of complementary gene interaction.The $F_1$ generation obtained from the cross $AABBCC 	imes aabbcc$ will have the genotype $AaBbCc$.When $F_1$ $(AaBbCc)$ is selfed,the probability of obtaining a dominant allele for each gene independently is $\frac{3}{4}$ (since $Aa 	imes Aa$ gives $\frac{3}{4}$ dominant phenotypes).Since the genes $A$,$B$,and $C$ assort independently,the probability of the offspring having at least one dominant allele for all three genes $(A-B-C-)$ is calculated as:$P(A-B-C-) = P(A-) 	imes P(B-) 	imes P(C-) = \frac{3}{4} 	imes \frac{3}{4} 	imes \frac{3}{4} = \frac{27}{64}$.Thus,the proportion of purple-flowered plants in the $F_2$ generation is $\frac{27}{64}$.

Similar Questions

Presence of a single allele of a character in a diploid organism is known as $:$

On the basis of Mendel's work,which of the following laws were formulated?
$I.$ Linkage
$II.$ Segregation
$III.$ Incomplete dominance
$IV.$ Independent assortment
Choose the correct option.

Assertion $A$: Gene is the unit of inheritance.
Reason $R$: The properties of tissues are due to the constituents of their cells.
Which option is correct for Assertion $A$ and Reason $R$?

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