Question 9(b)(ii)
[Maximum number: 4]
The ability of humans to taste a chemical called PTC is controlled by a single gene.
The ability to taste PTC is coded for by a dominant allele, T.
Not being able to taste PTC is coded for by a recessive allele, t.
The pedigree diagram shows the individuals in a family who can taste PTC and those who cannot taste PTC.
male who cannot taste PTC male who can taste PTC female who cannot taste PTC female who can taste PTC
Determine the probability of individuals 3 and 4 having another child that can taste PTC and is male.
Use a genetic diagram to show your working.