20. Extending Mendelian Genetics

Question 1

what are the four gene dominacne relationships?

Answer 1

complete dominance incomplete dominance co-dominance multiple alleles

Question 2

define complete dominance

Answer 2

the dominant allele is expressed

Question 3

define incomplete domincance

Answer 3

intermediate inheritance - a combination of both parental alleles that makes a third phenotype. eg purple flower crossed with white flower makes pink

Question 4

define co-dominance

Answer 4

two forms of a gene is present and neither is dominant or recessive, both alleles are equal

Question 5

define multiple gene epatasis

Answer 5

one gene affects the phenotypic expression of another gene. it influences another traits and is a chian reaction. genotypes and phenotypes are different

Question 6

define polygenic inheritance

Answer 6

more than one gene involved in determining phenotype

Question 7

what is hemizygous?

Answer 7

genotype description for x linked sex genes who only have one allele. eg:

male:

XwY

female: XwXw

y chromsome is to small