In human males,all the chromosomes are paired perfectly except one. These unpaired chromosomes are:
$(i)$ Large chromosome
$(ii)$ Small chromosome
$(iii)$ $Y$-chromosome
$(iv)$ $X$-chromosome

  • A
    $(iii)$ and $(iv)$
  • B
    $(iii)$ only
  • C
    $(i)$ and $(ii)$
  • D
    $(ii)$ and $(iv)$

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Similar Questions

Mendel crossed a pea plant having inflated green pod with a constricted yellow pod.
$(a)$ What type of a cross is it?
$(b)$ What type of plants are obtained in $F_{1}$ generation?
$(c)$ In $F_{2}$ generation the phenotype ratio is $9:3:3:1$. State the rule for the inheritance of traits observed by Mendel.

$(a)$ Distinguish between homologous and analogous organs.
$(b)$ State one evidence of organic evolution.

What is micro-evolution? Does it explain speciation?

$(a)$ Differentiate between:
$(i)$ Homologous organs and Analogous organs
$(ii)$ Pollination and Fertilisation
$(b)$ What do fossils tell us about the process of evolution?

What is the genetic constitution of the $23$rd pair of sex chromosomes in a human female?

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