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Question 19N.1A.SL.TZ0.16

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.1A.SL.TZ0.16
Level SL Paper 1A Time zone TZ0
Command term Deduce Question number 16 Adapted from N/A
16.
[Maximum mark: 1]
19N.1A.SL.TZ0.16

A pair of alleles controls the secretion of antigens corresponding to blood group in saliva. Examine the pedigree chart.

[Source: © International Baccalaureate Organization 2019]

 

Based on this pedigree chart, which best describes the allele conferring antigen secretion in saliva?

A. Dominant

B. Recessive

C. Sex-linked

D. Co-dominant

[1]

Markscheme

A

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