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5.1 Inheritance

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Question 27

In birds, sex is determined by the ZW ZW\,ZW sex-determination system, where males are homogametic (ZZZZZZ) and females are heterogametic (ZWZWZW).

An ecologist studies an isolated population of kakapo (Strigops habroptilus) on an island. The population consists of:

  • 1,400 1,400\,1,400 males
  • 1,600 1,600\,1,600 females

How many Z Z\,Z chromosomes are present in the sex chromosomes of this entire population?

A

3,0003,0003,000

B

4,4004,4004,400

C

4,6004,6004,600

D

6,0006,0006,000

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.

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