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5.1 Inheritance

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Question 11

The domestic dog (Canis lupus familiaris) has a diploid chromosome number of 2n=782n = 782n=78 in its somatic cells. During reproduction, a haploid sperm cell fertilises a haploid egg cell to form a diploid zygote.

Which of the following correctly identifies the number of chromosomes present in a dog sperm cell, and the number of homologous pairs of chromosomes present in a healthy dog zygote?

A

Sperm cell: 393939 chromosomes; zygote: 393939 homologous pairs

B

Sperm cell: 393939 chromosomes; zygote: 787878 homologous pairs

C

Sperm cell: 787878 chromosomes; zygote: 393939 homologous pairs

D

Sperm cell: 787878 chromosomes; zygote: 787878 homologous pairs

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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