Biology Test Chapter 7

Front 1

carrier

Back 1

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

Hint 1

•only females can be a carrier
•does not show disease symptoms
•would be heterozygous

Front 2

sex-linked gene

Back 2

gene that is located on the x or y chromosome

Hint 2

•XX is female and XY is male
•female can only pass an X chromosome but males have 50% that can pass X or Y

Front 3

X chromosome inactivation

Back 3

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

Hint 3

•females are a patchwork of two types of cells-one type with an active X chromosome that came from the mother and a second type with an active X chromosome that came from the father.

Front 4

incomplete dominance

Back 4

heterozygous phenotype that is a BLEND of two heterozygous phenotypes.

Hint 4

like red flowers crossed with white flowers create pink flowers

Front 5

codominance

Back 5

heterozygous genotype that equally expresses the traits from both alleles

Hint 5

red flowers crossed with white flowers could create a flower that is partly red and partly white

Front 6

polygenic traits

Back 6

traits that are produced by two or more genes

Hint 6

AaBbCcDD would be an example

Front 7

linkage map

Back 7

diagram that shows the relative locations of genes on a chromosome

Hint 7

Front 8

pedigree

Back 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

Hint 8