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5.1 Inheritance

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Question 62

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

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

$1,400\,$ males
$1,600\,$ females

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

A

$3, 000$

B

$4, 400$

C

$4, 600$

D

$6, 000$

Markscheme

5.1 Inheritance Questions

GCSE
Biology
5.1 Inheritance

186 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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