Answer:
Option C is correct. 50% of the children will be able to roll their tongue
Explanation:
Available data:
- The diallelic gene TR controls the ability to roll the tongue
- The T allele expresses the ability to roll the tongue and is dominant
- The t allele expresses the inability of tongue rolling and is recessive
- Woman: Nontongue roller, tt
- Man: Heterozygous for tongue rolling, Tt
Cross: the Man and the woman
Parentals) Tt x tt
Gametes) T t t t
Punnett square)
T t
t Tt tt
t Tt tt
F1) 2/4 = 1/2 = 50% of the progeny will be heterozygous tongue roller individuals, Tt
2/4 = 1/2 = 50% of the progeny will not be tongue rollers, tt
50% of the children will be able to roll their tongue
