Chapter 5 checking your understanding

If two parents are both heterozygous for the sickle-cell trait, what is the probability of having an

offspring with sickle-cell anemia? Make a Punnett square for this question.

_____________________________________________________________________________________________

FIGURE 5.7 Punnett square

If two parents are both heterozygous for the sickle-cell trait, what is the probability of having an

offspring with sickle-cell anemia? Make a Punnett square for this question.

_____________________________________________________________________________________________

FIGURE 5.7 Punnett square

If two parents are both heterozygous for the sickle-cell trait, what is the probability of having an

offspring with sickle-cell anemia? Make a Punnett square for this question.

_____________________________________________________________________________________________

FIGURE 5.7 Punnett square

p2 = __________________

2pq (this translates to 2 × p × q) = __________________

q2 = __________________

p2 + 2pq + q2 = __________________

_________ _________ _________ = _____________ (this should be somewhere close to 1) LL Ll ll

Percentage of cats Number of cats

Homozygous dominant cats: ______________% ______________

Heterozygous cats: ______________% ______________

Homozygous recessive cats: ______________% ______________

100% 50 cats

1. Fill in the known values for p2 and q2 then complete the HardyWeinberg equation:
2. undefined:
3. 2pq this translates to 2 p q:
4. undefined_2:
5. p2 2pq q2:
6. undefined_3:
7. this should be somewhere close to 1:
8. Ll:
9. Percentage of cats:
10. undefined_4:
11. undefined_5:
12. Number of cats 1:
13. Number of cats 2:
14. Number of cats 3:

p2 = __________________

2pq (this translates to 2 × p × q) = __________________

q2 = __________________

p2 + 2pq + q2 = __________________

_________ _________ _________ = _____________ (this should be somewhere close to 1) LL Ll ll

Percentage of cats Number of cats

Homozygous dominant cats: ______________% ______________

Heterozygous cats: ______________% ______________

Homozygous recessive cats: ______________% ______________

100% 50 cats

1. Fill in the known values for p2 and q2 then complete the HardyWeinberg equation:
2. undefined:
3. 2pq this translates to 2 p q:
4. undefined_2:
5. p2 2pq q2:
6. undefined_3:
7. this should be somewhere close to 1:
8. Ll:
9. Percentage of cats:
10. undefined_4:
11. undefined_5:
12. Number of cats 1:
13. Number of cats 2:
14. Number of cats 3: