First slide

Double Fertilisation

Question

If stem has 2n = 10 number of chromosomes then find out
A - number of chromosome in endosperm.
B - number of chromosome in egg cell.
C - number of chromosome in each polar nucleus respectively.

Easy

A

15, 15, 20
B

10, 15, 20
C

15, 5, 5
D

10, 5, 15

Solution

If stem has 2n = 10 number of chromosomes, then
Endosperm = 3n = 5 x 3 = 15 chromosomes.
Egg cell = 1n = 1 x 5 = 5 chromosomes.
Polar nucleus = n = 1 x 5 = 5 chromosomes.

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