sex influenced, sex limited, expressivity and penetrance

Question 1

penetrance

Answer 1

the percentage of individuals with a given genotype who exhibit the phenotype associated with that genotype (For example, an organism may have a particular genotype but may not express the corresponding phenotype, because of modifiers, epistatic genes, or suppressors in the rest of the genome or because of a modifying effect of the environment)

Question 2

expressivity

Answer 2

the extent to which a given genotype is expressed at the phenotypic level

Question 3

sex influenced

Answer 3

autosomal traits that are influenced by sex –if a male has one recessive allele, he will show that trait, but it will take two recessive for the female to show that same trait

Question 4

sex limited

Answer 4

that a particular trait may not express at all in one of the two sexes – a female of the same genotype as a male with a certain phenotype will not show the same phenotype