In a mutational event, when adenine is replaced by guanine, it is the case of
Frameshift mutation
Transcription
transition
transversion
Which of the following phenomena leads to variation in $DNA$?
Which of the following is a sex linked character
___$(B)$___ 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
$(A) \;\;\quad\;\;(B)$
Mongolism syndrome is caused by