Question

A homozygous sweet pea plant with blue flowers (RR) and long pollen ($R_o{R}_o$) is crossed with a homozygous plant having red flowers (rr) and round pollen ($r_o{r}_o$). The resultant F${}_1$ hybrid is test crossed. Which of the following genotypes does not appear in its progeny?

• A. Rrrr${}_o$
• B. RrRr${}_o$
• C. rr$r_0$$r_0$
• D. rr$R_0$$r_0$

Answer 1

The correct option is A Rrrr${}_o$

Blue coloured flower long pollen

$RR{R}_0{R}_0$

$\downarrow$

$R{R}_0$

Red coloured flower round pollen

$rr{r}_0{r}_0$

$\downarrow$

$r{r}_0$

Ref. image

the absent genotype $-Rrr{r}_0$