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Edexcel IGCSE Biology 3.32 In human cells the diploid number of chromosomes

Edexcel IGCSE Biology 3.32 In human cells the diploid number of chromosomes
Edexcel IGCSE Biology syllabusBiology 4BI1First assessment 2019

Practise using chromosome diagrams and human gamete contexts to distinguish diploid 46 from haploid 23 clearly.

How this is tested

  • identify human sperm or egg nuclei as haploid with 23 chromosomes
  • explain diploid as two chromosome sets or 23 pairs, compared with one haploid set

Question 5(b)(i)

[Maximum number: 1]

The diagram shows the human female reproductive system with some structures labelled.

Figure for Question 5(b)(i) — Edexcel IGCSE Biology

For fertilisation to occur, a sperm needs to reach an ovum.

Which of these describes the number of chromosomes in the nucleus of a human sperm?

A

diploid number of 23 chromosomes

B

diploid number of 46 chromosomes

C

haploid number of 23 chromosomes

D

haploid number of 46 chromosomes