Which of the following is a sex-influenced character?

What is the number of chromosome pairs in maize $(Zea \ mays)$?

What will be the ratio of heterozygous,homozygous,and hemizygous color blindness in the offspring of a color-blind husband and a carrier wife?

$A$ 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 $abh$?

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.

Among the four couples given,who could be the biological parents of a child with $O^+$ blood group?