O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2022 · Q371 Mark

A variety of snail has an inherited condition that affects the thickness of the shell. St St have thick shells. St Sh have thin shells. Sh Sh do not survive. Two heterozygous snails are mated. What is the probability that a surviving snail of the next generation is a heterozygote?

A0.00

B0.25

C0.50

D0.67

✓ Correct answer

D: 0.67

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2022 Paper 1 Variant 1, question 37.

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