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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution1 Mark
MCQ
Which statement is true for a dominant allele?
  • A
    It cannot undergo mutation.
  • B
    It gives a greater chance of survival than a recessive allele.
  • ✓
    It gives the same phenotype in heterozygotes and homozygotes.
  • D
    It is only responsible for male characteristics.
✓

Answer

Correct option: C.
It gives the same phenotype in heterozygotes and homozygotes.
Allele which can express themselves in heterozygous conditions are dominant alleles while which does not are recessive allele.
Thus dominant allele gives the same phenotype in heterozygote and homozygote.
E.g. $TT$ has a phenotype of tall height $Tt$ also has a phenotype of tall height.

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