A the fraction of genes shared by two relatives in a

a. the fraction of genes shared by two relatives
In a study of fingerprints (Total Ridge Count), one group of twins had an observed correlation coefficient
of 0.95 while a second group of twins had a correlation coefficient of 0.49. We could conclude that
________.

d. TRC is almost totally under environmental control b. the first group of twins are monozygotic and
the second group of twins are dizygotic
Twin studies used to estimate the heritability of obesity suggest that about ______% of the phenotypic
variation in obesity is explained by genetic factors 70%
The human gene for leptin, comparable to the mouse obesity gene ob, ________
Which of the following statements about concordance is NOT true?
c. If heritability of a trait is high, there
will be little difference in concordance between MZ and DZ twins
Variants of genes that control salt and water retention, such as the gene for angiotensin (AGT), are
associated with which of the following multifactorial traits?
a. high levels of LDL lipoproteins
b. atherosclerosis
c. familial hypercholesteremia
d. essential hypertension d. essential hypertension
Which of the following statements about cholesterol is NOT correct? Skin color is controlled by ________.

b. two gene pairs
c. more than 70 gene pairs
d. genetic factors only a. genetic and environmental factors
Intelligence is accurately measured by ________.
In order to create a karyotype for chromosome analysis, ________.