Which of the following phenomena leads to variation in $DNA$?
Linkage, mutation
Recombination, linkage
Mutation, recombination
Aneuploidy, linkage
Free Martin condition is found in
Edward's syndrome, Patau's syndrome and Down's syndrome are due to
Mendel published his work on inheritance of characters in $1865$ but it remained unrecognised till $1900$ because
$(a)$ He could not provide any physical proof for the existence of factors
$(b)$ His concept of factors as stable, discrete units that controlled the expression of traits did not find acceptance from the contemporaries
$(c)$ Mendel's approach of using mathematics to explain biological phenomena was totally old
$(d)$ Communication was not easy (as it is now)
$A$ $Y-$linked gene is responsible for hypertrichosis (long hair on ears). When an affected man marries a normal woman, what percentage of their daughters would be expected to have hairy ears?
Genes for cytoplasmic male sterility in plants are generally located in