When the number of recombinant progeny is usually less than the number expected in independent assortment it is called

Mirabilis jalapa is a good example of

___$(B)$___ used the frequency of recombination between gene pairs on the ___$(A)$___ as a measure of the distance between genes and mapped their position on the chromosome

$(A) \;\;\quad\;\;(B)$

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 was the scientist to introduce $ABO$ blood groups

Loss of a $X$ chromosome in a particular cell during its development, results into