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ICSE Class 10 Answered

sir can there be a heterozygous recessive
Asked by ajaymukharje.nelakuditi | 28 Mar, 2020, 03:41: PM
answered-by-expert Expert Answer
  • No, there cannot be heterozygous recessive state.
  • Any trait or characteristic is determined by gene that exists in two alternative forms called alleles, one is dominant allele and the other is recessive allele.
  • Recessive trait is only expressed when the gene corresponding to it is present in the homozygous state ('tt' for dwarf plant) as presence of dominant gene masks the expression of recessive gene.
  • On the other hand, dominant trait is expressed when the gene corresponding to it is present in homozygous ('TT' for tall) or heterozygous dominant state ('Tt' for tall plant).
  • A genotype is either homozygous dominant (TT), homozygous recessive (tt) or heterozygous (Tt).
Answered by Sheetal Kolte | 28 Mar, 2020, 07:54: PM

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