Which pair of chromosomes is concerned with Down's syndrome
$7^{th}$
$18^{th}$
$21^{st}$
$23^{rd}$
Describe test cross. why it is necessary ?
The movement of a gene from one linkage group to another is called
In a cross between white-flowered parents, $F_1$ progeny was uniformly purple-flowered. The $F_2$ progeny showed a phenotypic ratio $9 : 7$ between purple-flowered and white-flowered plants. The above result indicates that the flower colour is controlled by
Who discovered $R{h^ - }$ factor
Who proposed the term 'Allelomorph'