Biology: Chapter 7

Question 1

carrier

Answer 1

organism whose genome contains a gene for a certain trait or disease that is not expressed in the organism’s phenotype

Question 2

sex-linked genes

Answer 2

gene that is located on the sex chromosome

Question 3

X chromosome inactivation

Answer 3

process that occurs in female mammals in which one of the X chromosomes is randomly turned off in each cell

Question 4

incomplete dominance

Answer 4

heterozygous phenotype that is a blend of the two homozygous phenotypes

Question 5

codominance

Answer 5

heterozygous genotype that equally expresses the traits from both alleles

Question 6

polygenic trait

Answer 6

trait that is produced by two or more genes

Question 7

linkage map

Answer 7

diagram that shows the relative locations of genes on a chromosome

Question 8

pedigree

Answer 8

chart of the phenotypes and genotypes in a family that is used to determine whether an individual is a carrier of a recessive allele

Question 9

karyotype

Answer 9

image of all of the chromosomes in a cell