Skip to content

Course home

Question bank·3.3 Inheritance
Sign up

3.3 Inheritance

EasyMediumHard
1234
Question 3

Four freshwater snails, P, Q, R and S, are compared for one shell-pattern gene.

Which snail is homozygous for this gene?

[1]
A

snail Q, with two different alleles of the gene

B

snail P, with two identical alleles of the gene

C

snail S, with the gene at two different loci

D

snail R, with one allele from each of two genes

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.

More questions