Inheritance and genetic crosses

Figure 1 shows the inheritance of cystinuria (an autosomal recessive kidney condition) in a family.

Figure 1: A pedigree chart showing the inheritance of cystinuria over two generations.

$T\,$ represents the dominant allele for normal amino acid transport.

$t\,$ represents the recessive allele for cystinuria.

A clinical geneticist states that Parent 2 must have the genotype $T t$ .

Explain why the geneticist is correct.

[2]

Inheritance and genetic crosses Questions

Figure 1 shows the inheritance of cystinuria (an autosomal recessive kidney condition) in a family.

Figure 1: A pedigree chart showing the inheritance of cystinuria over two generations.

$T\,$ represents the dominant allele for normal amino acid transport.

$t\,$ represents the recessive allele for cystinuria.

A clinical geneticist states that Parent 2 must have the genotype $T t$ .

Explain why the geneticist is correct.

[2]