Chapter 7

Question 0

carrier

Answer 0

does not show disease symp- toms, but can pass on the disease-causing allele to offspring.

Question 1

sex-linked genes

Answer 1

Genes that are located on the sex chromosomes are called

Question 2

X chromosome inactivation

Answer 2

In each cell of female mammals, one of the two X chromosomes is randomly “turned off ” by a process called

Question 3

incomplete dominance

Answer 3

in which a heterozygous phenotype is somewhere between the two homozygous phenotypes

Question 4

codominance

Answer 4

in which both traits are fully and separately expressed

Question 5

polygenic traits

Answer 5

Traits produced by two or more genes are called

Question 6

linkage maps

Answer 6

which are maps of the relative locations, or loci, of genes on a chromosome

Question 7

pedigree

Answer 7

chart can help trace the phenotypes and genotypes in a family to determine whether people carry recessive alleles

Question 8

karyotype

Answer 8

picture of all of the chromosomes in a cell