Ch. 24 Quantitative Genetics

Question 1

discontinuous characteristics

Answer 1

qualitative

• allows predictions about genotypes and genetic cross outcomes
• few distinct and discrete phenotypes

Question 2

continuous characteristics

Answer 2

quantitative

• polygenic (more than 1 gene involved in determining trait) and influenced by the environment, “multifactorial”
• many overlapping phenotypes

Question 3

polygenic traits

Answer 3

• many genotypes are possible
• more than one gene contributes to a particular trait
• several genotypes may produce same phenotype
• often environmental factors influence phenotype

Question 4

quantitative genetics

Answer 4

genetic analysis of complex characteristics

Question 5

quantitative trait loci (QTL)

Answer 5

chromosomal regions containing genes that influence a quantitative trait