In human males and females, how many pairs of chromosomes are identical (in $pairs$)?

$A$ cross between a tall plant $(TT)$ and a short pea plant $(tt)$ resulted in progeny that were all tall plants because:

In a pea plant,find the contrasting trait for the following:
$(a)$ The position of the flower is terminal.
$(b)$ The flower is white in colour.
$(c)$ The shape of the pod is constricted.

What is the genetic constitution of the $23$rd pair of sex chromosomes in a human male?

Study the following cross showing self-pollination in $F_1$ generation,fill in the blank,and answer the question that follows:
Parents: $RRYY \times rryy$
(Round,yellow) (Wrinkled,green)
$F_1$: $RrYy \times$ ?
(Round,yellow)

$A$ zygote which has an $X-$ chromosome inherited from the father will develop into a