Genetics Review

If an individual shows a recessive phenotype then the only genotype they can be is....

• homozygous dominant
• heterozygous
• homozygous recessive
• you can't tell

What is a phenotype?

• The expression of a trait; physical appearance.
• 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

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

The passing of genetic traits from parent to offspring.

• heredity
• trait
• gene
• allele

Tags

NGSS.MS-LS3-2

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

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

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

• homozygous
• hetrozygous
• protein
• chromosome

Tags

NGSS.HS-LS3-1

Which of the following alleles is homozygous recessive?

• Tt
• tt
• TT
• T

Which of the following is NOT a genotype?

• heterozygous
• a trait
• Bb
• homozygous recessive

AA and Aa always show up as

• dominant
• recessive

aa always shows up as

• dominant
• recessive