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Question 20N.1A.SL.TZ0.14

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.SL.TZ0.14
Level SL Paper 1A Time zone TZ0
Command term Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
20N.1A.SL.TZ0.14

Tall heterozygous pea plants were crossed and the resulting seeds grown. Out of 360 plants, 270 were tall and 90 dwarf. What describes the expected genotypes resulting from the cross?

A. All 270 tall plants were heterozygous.

B. All 270 tall plants were homozygous.

C. Only 90 plants were homozygous.

D. All dwarf plants were homozygous.

[1]

Markscheme

D

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