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6.1 Reproduction

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Question 4

In a laboratory-bred snail population, allele B B\,B gives a banded shell and is dominant to allele bbb, which gives an unbanded shell.

A banded snail whose parent was unbanded is mated with an unbanded snail. The breeder records three offspring. What is the probability that at least one of the three offspring has a banded shell? Assume each offspring is independent and no new mutations occur.

[1]
A

18\frac{1}{8}81​

B

38\frac{3}{8}83​

C

12\frac{1}{2}21​

D

78\frac{7}{8}87​

Markscheme

6.1 Reproduction Questions

  1. GCSE
  2. /Biology
  3. /6.1 Reproduction

62 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.

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