In $F_2-$generation, genotypic and phenotypic ratios are the same in the case of $-$

The number of chromosomes in the cells of bread wheat ($Triticum$ $aestivum$) indicates that it is ...... .

$A$ human male is heterozygous for autosomal genes $A$ and $B$ and is also hemizygous for the $hemophilia$ gene. What proportion of his sperm will be $abh$?

Dominant epistasis is shown by

Which of the following variations are temporary and have nothing to do with the last or next generation?

Read the following statements carefully $:-$
$(a)$ Linkage is physical association of genes on a chromosome.
$(b)$ In $Drosophila$, genes of body colour and eye colour are tightly linked on $X$-chromosome.
$(c)$ In honey bee a fertilised egg develops as a male $(drone)$.
$(d)$ In grasshopper males have only one $X$-chromosome besides the autosomes.
$(e)$ $Drosophila$ can complete their life cycle in about two months.
Choose the correct option having all correct options.