What is the estimated number of genes that code for proteins in a set of haploid chromosomes in humans?

• 25,000

• 30,000

• 20,000

• 35,000

In Mendel's experiments, what type of inheritance did he study using pea plants?

• Monohybrid inheritance

• Codominance

• Incomplete dominance

• Dihybrid inheritance

What does the term 'locus' refer to in genetics?

• A type of allele

• A specific location of a gene on a chromosome

• A type of chromosome

• A genetic disorder

Which of the following represents a homozygous dominant genotype?

• Aa

• AA

• A

• aa

What is the total number of chromosomes in a human somatic cell?

• 50

• 48

• 44

• 46

What is the phenotype ratio of a dihybrid cross?

• 3:1

• 1:2:1

• 9:3:3:1

• 1:1

Which blood group is an example of multiple alleles?

• ABO blood group

• O blood group

• B blood group

• A blood group

What is the genotype of a person with type O blood?

• IBIB

• IABO

• IAIO

• IAIB

What genetic condition is caused by nondisjunction?

• Huntington's disease

• Sickle cell anemia

• Down syndrome

• Cystic fibrosis

Which chromosome pair determines the sex of an individual?

• Autosomes

• Sex chromosomes

• Homologous chromosomes

• Sister chromatids