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AQA Foundation Tier Exam-style past paper with complete mark schemes, hints, AI assistance and detailed explanations.
Maple syrup urine disease (MSUD) is a rare inherited human condition. The allele for MSUD is recessive.
What is a recessive allele?
Figure 1 shows the inheritance of MSUD in one family. The symbol for a male with MSUD is not in the key. What would this symbol represent?
Persons 1 and 2 in Figure 1 have a child with MSUD and some children without MSUD.
Complete the Punnett square (Figure 2) to show the possible genotypes of the children.
Use the following symbols:
N = allele for not having MSUD
n = allele for MSUD
What percentage of the offspring in the Punnett square will have MSUD?
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