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What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?
A
21
B
42
C
63
D
84
Detailed Solution
Root tip cells are somatic (diploid) cells, so 2n = 42.
Therefore n = $\frac{42}{2}$ = 21.
The aleurone layer is the outer, protein-rich layer of the endosperm of cereal grains.
Endosperm is formed by triple fusion (one male gamete + two polar nuclei), so it is triploid (3n).
Number of chromosomes in aleurone cells = 3n = 3 × 21 = 63.
Therefore n = $\frac{42}{2}$ = 21.
The aleurone layer is the outer, protein-rich layer of the endosperm of cereal grains.
Endosperm is formed by triple fusion (one male gamete + two polar nuclei), so it is triploid (3n).
Number of chromosomes in aleurone cells = 3n = 3 × 21 = 63.