Philadelphia chromosome is

  • A

    $13^{th}$ chromosome

  • B

    $22^{nd}$ chromosome

  • C

    $17^{th}$ chromosome

  • D

    $21^{st}$ chromosome

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A fruit fly is heterozygous for sex-linked genes when meted with normal female fruit fly, the males specific chromosome will enter egg cell in the proportion

  • [AIPMT 1997]

In Drosophila, the allele for a normal grey body colour $G$ is dominant to ebony body $g.$ The following table summarises the results of several crosses

S.No Cross Result
$I.$ Strain $1 \times$ gg All wild type
$II.$ Strain $2 \times$ gg

$1$ wild type $:\;1$ ebony

$III.$ Strain $3 \times$ gg All ebony
$IV.$ Strain $4 \times$ Gg

$3$ wild type $:\,1$ ebony

Which strains both have the genotype Gg?

Identical twins are

The term 'gene' was coined by

Sometimes the separation of twins is incomplete and these are borne attached are remain so even after. Such twins are known as