genetics chapter 17

what is another name for a discontinuous trait?

qualitative

what is another name for a continuous trait?

quantititative

what is a discontinuous (qualitative) trait?

exhibits only a few, easiy distinguixhed phenotypes

what is a continuous (quantitative) trait?

exhibits a continuous range of phenotypes

polygenic

influence by genes at many loci

enironmental

factor effect

multifactorial

polygenic and influenced by environment

how many genes control skin color?

more than 20

what do most genes that control skin color control?

production adn cellular arrangement of melanin

are the effects of the genes that control melanin additive?

yes

melanosome

Carry the pigment granules that contain Melanin

is skin color a quantitiative or qualitative trait?

quantitative

whay type of inheritance is skin color inhereted through?

polygenic

the continuious distribution of quantitative traits is attributed to the fact that traits are influence both by _____ and by _____ factors

environmental; dominance

waht does the variance (s2) provide?

information about the variability of a group of phenotypes

waht does the regression coeffeicient allow us to predict?

the value of one variable given a value of another

What does the correlation coefficient measure?

the relation between 2 or more variables

positive correlation

indicates that there is a direct association between variables

negative correlation

indicates that there is an inverse association between varibles

what does the regression linve reflect?

the line of best fit for all points on the graph

what does the regression coefficient represent?

the slope of the regression line