Sex chromosomes of a female bird are represented by

Holandric genes are

In humans,sex-linked traits are primarily transmitted by:

Which scientist discovered sex determination in $Melandrium$ $album$?

If the $X/A$ ratio of two Drosophila individuals is $0.6$ and $0.33$ respectively,what will be their sex?

Statement $1$: Mother should not be blamed for the birth of the girls in the family.
Statement $2$: Father is not responsible for the sex of the child.