Choose correct pair :
Maize- $17$ - chromosome number in meiocyte $(2n)$
Potato- $24$ -chromosome number in gametes $(n)$
Housefly- $20$ -chromosome number in meiocyte $(2n)$
Rat- $19$ - chromosome number in gamete $(n)$
Which is correct sentence ?
Select the incorrect pair.
$(a)$ In both plants and animal, have three phases during their life cycle.
$(b)$ In plant and animal, hormones are responsible for the transitions between the three phase.
Which one of the following generates new genetic combinations leading to variation?
Select the incorrect pair :