The sex in Drosophila melanogaster is determined by
$X$ chromosomes
$X$ and $Y$ chromosomes
Autosomes
$X$ chromosomes and autosomes
It's Obvious
When a segment of a chromosome breaks and later rejoins after $180^{\circ}$ rotation,it is known as
Brachydactyly is due to
When a plant of $F_1$ generation is crossed with homozygous dominant parents, it is known as
In erythroblastosis foetalis, which factors of the mother pass through placenta into the foetus
Normally $DNA$ molecule has $A-T, G-C$ pairing. However, these bases can exist in alternative valency status, owing to rearrangements called
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