A gene is said to be dominant if:
Correct answer: C. It expresses it's effect both in homozygous and heterozygous condition.
- A. It expresses it's effect only in homozygous state.
- B. It expresses it's effect only in heterozygous condition.
- C. It expresses it's effect both in homozygous and heterozygous condition.
- D. It never expresses it's effect in any condition.
Explanation
A gene is considered dominant when its effect is expressed both in homozygous and heterozygous conditions. In heterozygotes, the dominant allele masks the expression of the recessive allele. This is a fundamental concept in classical Mendelian genetics.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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