Ch16

Most traits are not due to __________ genes.

single

Complex traits are due to __________ genes.

multiple

Traits that vary continuously from value X to Y are considered __________ traits.

quantitative

Latest DNA analysis suggests about __________ genes are involved in complex traits.

700

Insufficient nutrition is an example of an __________ risk factor.

environmental

In genotype-by-environment interactions, mice fed a high-fat diet weigh more due to __________.

environment

Heritability refers to the variation in a population due to __________.

genes

Identical twins share __________ genes because they originate from one fertilized oocyte.

the same

If identical twins show more similarity than fraternal twins, it may suggest the influence of __________.

genes

Concordance measures how often __________ are the same between twins.

twins

High heritability in autism spectrum disorder ranges from __________ to __________ percent.

64-91

About __________ percent of birth anomalies are considered complex traits.

70

__________ twins share approximately 50% of their genes.

Fraternal

The study of heritability is easiest with __________ studies.

twin

The amount of nitrogen enrichment affects the yield of __________ strains of corn.

corn