Yr10 Genetics Pop Quiz

Which of the following is a correct definition of genetics?

• The study of transmission of traits from parent to offspring

• The study of variation between members of a species

• The study of genes and traits defined by genes

• The study of DNA

The human genome is distributed across 24 chromosomes.

• True

• False

Which statement concerning a pair of alleles for a gene controlling a single characteristic in humans is true?

• Both genes come from the father.

• Both genes come from the mother.

• One gene comes from the mother and one gene comes from the father.

• The genes come randomly in pairs from either the mother or father.

Which combination of sex chromosomes results in a male human being?

• XX

• YY

• XY

• either XX or YY

The different forms of a gene are called

• alleles

• factors

• masks

• traits

Scientists call an organism that has two different alleles for a trait a

• factor

• hybrid

• Purebred

• trait

An individual who has two of the same allele is said to be

• homozygous

• heteromologous

• homologous

• heterozygous

An individual who has two different alleles is said to be

• homozygous

• heteromologous

• homologous

• heterozygous

A carrier is a person who has

• one recessive and one dominant allele for a trait

• two recessive alleles for a trait

• two dominant alleles for a trait

• more than two alleles for a trait

Where two alternatives for a trait are tall and short, and tall is dominant, the genotype of a heterozygous individual should be expressed as

• a) Ss

• b) sS

• c) Tt

• d) tT