Which gene is lethal in maize?

In Mr. Kapoor,there is a pair of autosomal genes $Bb$ and a sex-linked factor $d$. What will be the proportion of $Bd$ in his sperm?

In bread wheat,the chromosome number is:

Which of the following statements are incorrect? $(i)$ $ABO$ blood grouping is controlled by gene $I$. (ii) Gene $I$ has four alleles. (iii) $I^A$ and $I^B$ produce the same type of sugar. (iv) $I$ or $i$ produces a different type of sugar. $(v)$ $I^A$ and $I^B$ are incompletely dominant.

Tjio and Levan's contribution is very significant because they

Which of the following is a sex-influenced character?