SL/HL Topic D3.2 Inheritance (id: 5edbf33e5)

本题目来源于试卷: SL/HL Topic D3.2 Inheritance，类别为 IB生物学

[问答题]
7. Amand has a daughter with Padmabjqng-(:3qju 0o -ci4q3pmo f vathi. A7zip /.v0 l:p*uq tuvtmand is blood group A, Padmavathi is blood group B, and their daughteru*u t0vl7ppi.qv z t/: is blood group O. They are having a second child, a son.
Deduce the probability that their unborn son will be blood group O. Explain your working.

参考答案:

Any three of these points for 3 marks:

Both Amand and Padmavathi must be heterozygous because their daughter has inherited two ‘i’ alleles.

Amand’s genotype is $l^{A}i$. & Padmavathi genotype is $l^{B}i$.

Blood group is an autosomal gene, it is not sex-linked/not affected by gender.

The probability of their son having blood group 0 is 25% (1/4, 0.4)

This can be shown in a punnet square:

Note – points can also be awarded in the Punnett square.

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