Inheritance

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Question 7
Hard

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?

316\frac{3}{16}163​

38\frac{3}{8}83​

14\frac{1}{4}41​

916\frac{9}{16}169​

Inheritance Questions

  1. GCSE
  2. /Biology
  3. /Inheritance