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#dominant allele

3 public questions tagged with this topic.

BOTANY

Which of the following statements correctly defines a dominant allele?

A dominant allele is expressed in both homozygous (AA) and heterozygous (Aa) conditions. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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Population Genetics

If p is the frequency of dominant allele, q is equal to

In biallelic system p denotes frequency of one allele, typically dominant or more common A, while q represents other allele a. Because these two exhaust allelic possibilities at locus, their sum equals one. Rearranged gives q = 1 - p, allowing calculation of recessive allele frequency when dominant frequency known through p + q = 1 equilibrium. This complementarity underlies Hardy-Weinberg genotype predictions and estimation of heterozygous carrier frequency as 2pq. If p changes due to selection, q adjusts correspondingly maintaining total allele pool constant.

Ref: Griffiths et al., Introduction to Genetic Analysis, Chapter 20: Allele Complement Relationship; Hartl & Clark

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