Help me please Practice Exercise 3
2. In humans there are four types of blood: type A. type B, type AB and type O. A person with a genotype of lala or lait
will have blood type ?

A. A
B. B
C. 0
D. AB

3. Blood type O has both antibodies A and antibodies B
in the plasma but has no
antigen on its erythrocytes or
red blood cells. That is why
Blood Type O is considered.
UNIVERSAL

A. Blood
B. Donor
C. Marker
D. Recipient

4. A couple has four children. one son and three daughters. What is the chance that the fifth child will be a daughter?

A. ¼
B. ½
C. ¾
D. 1/5

5.A man is colorblind but there is no history of this disorder in his wife's family. What is the chance that their son is color blind?
A. 0%
B. 25%
C. 75%
D. 100%

6. What is a sex- linked trait that 1 point results in the inability to have normal blood clotting?

A. baldness
B. color blindness
C. diabetes
D. hemophilia

7. Melvin's thinning hair is like that of his father. This characteristic of baldness is due to
A. multiple alleles.
B. sex-linked
C. sex-influenced
D. sex-limited

8. Color-blindness is inherited as a sex-linked recessive trait. If a normal woman, carrier of the gene marries a man with. normal color vision. What would be the expected phenotype of their children with reference to color-blindness?

A. All color-blind
B. 2 carriers, 2 color-blind
C. 1 normal, 3 carriers
D. 2 normal, 1 carrier, 1 color-blind

​