Genetics

Which statement below describes RECESSIVE alleles?

• expressed when at least one is present

• only expressed when 2 are present

What is a specific observable characteristic of an organism?

• DNA

• Gene

• Trait

• Chromosome

What is  a single, highly organized and structured piece of DNA, which contains many genes?

• Karyotype

• Allele

• Chromosomes

• Trait

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

The passing of genetic traits from parent to offspring.

• heredity
• trait
• gene
• allele

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

Which of the following alleles is homozygous recessive?

• Tt
• tt
• TT
• T

AA and Aa always show up as

• dominant
• recessive

Gene

• The physical appearance of the allele combination the offspring receives
• The chemical compound found in the nucleus of each cell; the genetic code for all of your traits 
• A section of DNA that codes for a trait 
• A combination of two alleles that are the same.