Genetics and Heredity

Genetics

• Factors that control traits

• Having two identical alleles for a trait

• The science of how traits are passed down from parent to offspring

• The physical appearance or visible traits

Hybrid

• An organism that has two different alleles for a trait

• A trait that is hidden when the dominant allele is present

• A physical characteristic

• Number that describes how likely it is that an event will occur

What is the probability that two heterozygous pea plants have a homozygous dominant pea plant offspring?

• 0%

• 25%

• 75%

• 100%

Genes

• Chart that shows all the possible combinations of alleles that can result from a genetic cross

• The science of how traits are passed down from parent to offspring

• Recessive allele

• Factors that control traits

What is the probability of a tall (dominant) pea plant and a short pea plant having a short pea plant?

• 100%

• 0%

• 25%

• 50%

Heredity

• The passing of traits from parent to offspring

• The science of how traits are passed from parent to offspring

• Genes

• Purebred

Dominant allele

• A trait that will always show up if the allele is present

• A trait that is hidden when a dominant trait is present

• A physical characteristic

• The genetic makeup or combination of alleles

Hybrid

• The offspring of many generations that has the same traits and alleles

• Different forms of a gene

• Number that describes how likely it is that an event will occur

• An organism that has two different alleles for a trait

If a heterozygous brown-haired dog crosses with a homozygous brown-haired dog, what are all the possible genotypes for their offspring?

• Bb, Bb, bb, bb

• BB, BB, BB, BB

• BB, BB, Bb, Bb

• bb, bb, BB, BB

Homozygous

• The offspring of many generations that has the same traits and alleles

• Factors that control traits

• The physical appearance or visible traits

• Having two identical alleles for a trait