Question:medium

In Hardy–Weinberg equilibrium, the sum of gene frequencies is: ____.

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While $p + q = 1$ is for allele (gene) frequencies, the formula for genotype frequencies is $p^2 + 2pq + q^2 = 1$. In both cases, the sum is always 1!

Updated On: May 16, 2026

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The Correct Option is B

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Top Questions on Regulation of Gene Expression

Match the following genes of the lac operon listed in column ‘A’ with their respective products listed in column ‘B’:
\[ \begin{array}{|c|c|} \hline \textbf{A: Gene} & \textbf{B: Products} \\ \hline \text{a. ‘i’ gene} & \text{(i) β-galactosidase} \\ \text{b. ‘z’ gene} & \text{(ii) lac permease} \\ \text{c. ‘a’ gene} & \text{(iii) repressor} \\ \text{d. ‘y’ gene} & \text{(iv) transacetylase} \\ \hline \end{array} \] Select the correct option:
- CBSE Class XII - 2024
- Biology
- Regulation of Gene Expression
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Match List I with List II:

List I		List II
A	Two or more alternative forms of a gene	I	Back cross
B	Cross of F₁progeny with homozygous recessive parent	II	Ploidy
C	Cross of F progeny with any of the parents	III	Allele
D	Number of chromosome sets in plant	IV	Test cross