GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
100%
|
|
|
50%
|
|
|
0%
|
|
|
Impossible to tell
|
Detailed explanation-1: -So, the correct answer is ‘50% sons will have haemophilia’.
Detailed explanation-2: -A female who is a carrier has a 50-50 chance that each male child will have hemophilia. There is a 50-50 chance that each female child will be a carrier (Picture 2).
Detailed explanation-3: -Each daughter has a 1 in 2 (50%) chance of getting her mother’s hemophilia allele and being heterozygous. Overall, there is a 1 in 4 (25%) chance for each pregnancy that the baby will be a son with hemophilia and a 1 in 4 (25%) chance that the baby will be a heterozygous daughter.
Detailed explanation-4: -a 25% (one in four) chance of having a son with hemophilia. a 25% chance of having a son with normal blood clotting. a 25% chance of having a daughter who is a carrier.
Detailed explanation-5: -Based on the Punnett square, there is a 50% probability that the children will have hemophilia. For the female offspring, the possible genotypes are XH, Xh X H, X h (carrier) and Xh, Xh X h, X h (hemophiliac). For the male offspring, the possible genotypes are XH, Y X H, Y (no disease) and Xh, Y X h, Y (hemophiliac).