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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution1 Mark
MCQ
An allele is said to be dominant if :
  • A
    It is expressed only in heterozygous condition.
  • B
    It is expressed only in homozygous condition.
  • ✓
    It is expressed in both homozygous and heterozygous conditions.
  • D
    It is expressed only in second generation.
✓

Answer

Correct option: C.
It is expressed in both homozygous and heterozygous conditions.
Alleles are the two individual genes in a particular gene pair that occupy the same locus or position on a homologous pair of chromosomes.
An allele may be dominant or recessive.
If the allele is expressed in both homozygous $(TT$ or $tt)$ and heterozygous $(Tt)$ conditions, then it is a dominant allele.
Recessive alleles express in only homozygous conditions.

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