Skip to content

Course home

Sign up

5.1 Inheritance

EasyMediumHard
1234567
Question 2

In a breed of domestic poultry, feather colour is controlled by two genes, I/i I/i\,I/i and C/cC/cC/c, located on different autosomes.

  • The dominant allele I I\,I is epistatic and inhibits the expression of pigment, resulting in white feathers.
  • The recessive allele i i\,i allows pigment expression.
  • The dominant allele C C\,C produces black pigment, whereas the recessive allele c c\,c produces brown pigment (in the absence of the dominant I I\,I allele).

A cock of genotype IiCc IiCc\,IiCc is crossed with a hen of genotype iiCciiCciiCc.

What is the probability that an offspring from this cross will have black feathers?

A

316\frac{3}{16}163​

B

38\frac{3}{8}83​

C

14\frac{1}{4}41​

D

916\frac{9}{16}169​

Markscheme

5.1 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /5.1 Inheritance

97 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank