Heredity hard

Heredity Quiz (Hard)

1. What is the name of the phenomenon where a single gene influences multiple traits?

a) Codominance b) Incomplete dominance c) Polygenic inheritance d) Pleiotropy

2. In humans, the ABO blood group system is an example of:

a) Codominance b) Incomplete dominance c) Multiple alleles d) Pleiotropy

3. In cats, black fur color (B) is dominant to orange fur color (b). If two heterozygous black cats (Bb) are crossed, what is the probability of getting an orange kitten?

a) 0% b) 25% c) 50% d) 75%

4. Hemophilia is a sex-linked recessive disorder. If a carrier mother (XHXh) and a normal father (XHY) have children, what is the probability that a daughter will be a carrier for hemophilia?

a) 0% b) 25% c) 50% d) 100%

5. In fruit flies, the gene for body color (B) is autosomal and exhibits incomplete dominance. A purebred black fly (BB) is crossed with a purebred white fly (bb). What will be the phenotype of the offspring?

a) All black b) All white c) All gray d) Half black and half white

6. A human male inherits the X chromosome from:

a) His mother b) His father c) Both parents d) Neither parent

7. Which of the following genetic disorders is caused by the presence of an extra chromosome 21?

a) Hemophilia b) Down syndrome c) Cystic fibrosis d) Huntington's disease

8. In cattle, coat color is determined by codominant alleles. A roan cow (Rr) is crossed with a roan bull (Rr). What will be the phenotypic ratio of the offspring?

a) 1:2:1 roan to red to white b) 1:1 roan to white c) 3:1 roan to white d) 4:0 roan to white

9. Which of the following is an example of an inherited disorder caused by a faulty protein involved in chloride ion transport?

a) Hemophilia b) Down syndrome c) Cystic fibrosis d) Huntington's disease

10. What is the probability of getting a male child in humans?

a) 25% b) 50% c) 75% d) 100%