chapter 11

Question 1

physically, what are different alleles

Answer 1

different DNA sequences found at the same locus on homologous chromosomes

Question 2

phenotype

Answer 2

the organisms appearance or distinguishable trait

Question 3

pleiotropic

Answer 3

a single genetic locus that controls more than one trait

Question 4

characters that vary along a continuum, following a normal distribution, are often controlled by multiple genes, each contributing to the phenotype in an additive fashion

Answer 4

polygenic inheritance

Question 5

alternative versions of genes

Answer 5

alleles

Question 6

heterozygous phenotype same as that of homozygous dominant

Answer 6

complete dominance of one allele

Question 7

heterozygous phenotype intermediate between the two homozygous phenotypes

Answer 7

incomplete dominance in either allele

Question 8

both phenotypes expressed in heterozygotes

Answer 8

codominance

Question 9

in the whole population, some genes have more than two alleles

Answer 9

multiple alleles

Question 10

one gene is able to affect multiple phenotypic characters

Answer 10

pleitropy

Question 11

epistasis

Answer 11

phenotypic expression of one gene affects the expression of another gene

Question 12

in an organismal level-disease the allele is recessive T/F

Answer 12

T

Question 13

at the biochemical level-enzyme activity level alleles are completely dominant T/F

Answer 13

False alleles are incompletely dominant

Question 14

on the molecular level-amt. functional vs. dysfunctional

alleles are completely dominant T/F?

Answer 14

False alleles are codominant

Question 15

autosomal recessive disorders show up only in individuals homozygous recessive for the allele T/F

Answer 15

T