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3.3 Inheritance

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Question 16

Shell banding in a species of snail is inherited through one gene. Unbanded shells are produced by the dominant allele UUU; banded shells are produced by allele uuu. Two snails, each with genotype UuUuUu, are expected to produce 120 young in total.

How many of these young are expected to have unbanded shells?

[1]
A

606060

B

909090

C

808080

D

303030

Markscheme

3.3 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /3.3 Inheritance

71 exam-style questions on Edexcel GCSE Biology 3.3 Inheritance, covering 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features. Each one has a worked solution and a mark scheme showing where the marks go.

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