Human Inheritance

1. What does it mean for a trait to be dominant?

• A. It is only expressed when two copies are present.

• B. It is always expressed when at least one copy is present

• C. It is weaker than the recessive trait

• D. It depends on the environment

2. 2. What genotype represents a homozygous dominant individual?

• A. Aa

• B. AA

• C. aa

• D. AB

3. Does dominant traits are always common?

• Yes

• No

4. Which genetic disorder is an autosomal recessive?

• A. Huntington's disease

• B. Cystic fibrosis

• C. Marfan Syndrome

• D. Achondroplasia

5. Which of the following are recessive traits?

• A. Blue eyes

• B. Curly hair

• C. Free earlobes

• D. Type O blood

6. If an individual with genotype Aa mates with an individual with genotype aa, what percentage of their offspring is expected to display the recessive phenotype?

• A. 0%

• B. 25%

• C. 50%

• D. 75%

7. Which statement is true regarding dominant and recessive alleles?

• A. Dominant alleles are always common in a population

• B. Recessive alleles only express their phenotype when paired with another recessive allele

• C. Dominant alleles can only be inherited from one parent

• D. Recessive alleles are stronger than dominant allele

8. 8. Two heterozygous parents (Aa) can produce three different genotypes

• True

• False

9. Which term describes an organism with two different alleles for a trait?

• A. Homozygous

• B. Heterozygous

• C. Genotype

• D. Recessive

10. If a trait is carried on the dominant allele, it will be expressed even if the genotype is _______