| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.HL.TZ1.10 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Calculate | Question number | 10 | Adapted from | N/A |
Question
The feather colour of a certain breed of chicken is controlled by codominant alleles. A cross between a homozygous black-feathered chicken and a homozygous white-feathered chicken produces all speckled chickens. What phenotypic ratios would be expected from a cross between two speckled chickens?
A. All speckled
B. 1 black feathers : 1 white feathers
C. Speckled, black feathers and white feathers in equal numbers
D. 1 black feathers : 2 speckled feathers : 1 white feathers
Markscheme
D
Examiners report
[N/A]
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