DP Biology (last assessment 2024)

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Question 22M.1.SL.TZ2.16

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.SL.TZ2.16
Level SL Paper 1 Time zone TZ2
Command term Question number 16 Adapted from N/A
16.
[Maximum mark: 1]
22M.1.SL.TZ2.16

A cloning method used for livestock involves in vitro fertilization (IVF) with selected male and female gametes. The diagram shows the steps followed after in vitro fertilization.

[Source: Aldona Griskeviciene / Shutterstock.com.]

 

What does X represent?

A. A group of eggs

B. An embryo

C. A follicle

D. A group of zygotes

[1]

Markscheme

B

Examiners report

This question proved very difficult and did not discriminate well. Most students answered D, and may have assumed that X represented a group of zygotes. The question was taken from section 3.5 of the guide which states that ‘animals can be cloned at the embryo stage by breaking up the embryo into more than one group of cells’, but this may not have been clear in the diagram which was criticised for several reasons.

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