Genetics Terminology and Concepts

Front

What do you call an organism with two different alleles for a trait?

Back

Heterozygous

Front

What is the probability of obtaining the genotype Aa from a cross?

Back

50%

Front

What is a segment of DNA that codes for a particular protein?

Back

Gene

Front

What term describes the physical appearance of a trait?

Back

Phenotype

Front

What are the possible genotypes for a cross that results in TT = 25%, Tt = 50%, tt = 25%?

Back

TT = 25%, Tt = 50%, tt = 25%.

Front

What do you call the genetic makeup of an organism?

Back

Genotype

Front

What is the term for different forms of a gene?

Back

Alleles

Front

What is the expected phenotypic ratio in a monohybrid cross?

Back

3:1

Front

What is the term for the observable characteristics of an organism?

Back

Phenotype

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present; recessive alleles require two copies to express their trait.