Genetics

What is one advantage of sexual reproduction?

• offspring are identical to parents
• offspring are resistant to viruses
• offspring are born live, rather thna from eggs
• offspring inherit a wider variety of genetic information

What is a phenotype?

• The expression of a trait; what you see.
• refers to the genetic makeup of an individual
• An organism that has the same genes for a trait (ex. TT or tt)
• the passing of traits from parent to offspring

The inherited combination of alleles is known as the offspring's

• heredity
• phenotype
• genotype
• redigree

Sex cells are produced through the process of

• mitosis
• cytokinesis
• binary fission
• meiosis

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

If T=Tall & t=short, what is the genotypic ratio?

• 1:3
• 3:1
• 1:2:1
• 2:2

If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?

• 100% Tt
• 50% Tt, 50% tt
• 75%Tt, 25%tt
• 25%TT, 50%Tt, 25%tt

An offspring will receive how many alleles from each parent to determine a specific trait?

• one
• two
• three
• five

having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele