Hybrid vigour is due to

  • A
    Heterosis
  • B
    Epistasis
  • C
    Complementary genes
  • D
    Supplementary genes

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$A$ human male is heterozygous for autosomal genes $A$ and $B$ and is also hemizygous for the $hemophilia$ gene. What proportion of his sperm will be $abh$?

$A$ back-cross is a cross between ........

What percentage of homozygous $Rh^{-}$ children will be born to a couple where the husband is heterozygous for $Rh^{+}$ and the wife is homozygous for $Rh^{-}$ (in $, \%$)?

It is said that harmful alleles are eliminated from a population over a period of time,yet sickle cell anaemia persists in the human population. Why?

On the basis of Mendel's work,which of the following laws were formulated?
$I.$ Linkage
$II.$ Segregation
$III.$ Incomplete dominance
$IV.$ Independent assortment
Choose the correct option.

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