Philadelphia chromosome is
$13^{th}$ chromosome
$22^{nd}$ chromosome
$17^{th}$ chromosome
$21^{st}$ chromosome
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
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