Biology Ch 14

Front 1

allele

Back 1

(uh-le´-ul) Any of the alternative versions of a gene that produce distinguishable phenotypic effects.

Front 2

amniocentesis

Back 2

(am´-ne-o-sen-te´-sis) A technique of prenatal diagnosis in which amniotic fluid, obtained by aspiration from a needle inserted into the uterus, is analyzed to detect certain genetic and congenital defects in the fetus.

Front 3

carrier

Back 3

In genetics, an individual who is heterozygous at a given genetic locus, with one normal allele and one recessive allele. The heterozygote is phenotypically dominant for the character determined by the gene but can pass on the recessive allele to offspring.

Front 4

character

Back 4

An observable heritable feature.

Front 5

chorionic villus sampling (CVS)

Back 5

The situation in which the phenotypes of both alleles are exhibited in the heterozygote because both alleles affect the phenotype in separate, distinguishable ways.

Front 6

codominance

Back 6

The situation in which the phenotypes of both alleles are exhibited in the heterozygote because both alleles affect the phenotype in separate, distinguishable ways.

Front 7

complete dominance

Back 7

The situation in which the phenotypes of the heterozygote and dominant homozygote are indistinguishable

Front 8

cystic fibrosis

Back 8

cystic fibrosis


(sis'-tik fi-bro'-sis) A human genetic disorder caused by a recessive allele for a chloride channel protein; characterized by an excessive secretion of mucus and consequent vulnerability to infection; fatal if untreated

Front 9

dihybrid

Back 9

(di´-hi´-brid) An organism that is heterozygous with respect to two genes of interest. All the offspring from a cross between parents doubly homozygous for different alleles are dihybrids. For example, parents of genotypes AABB and aabb produce a dihybrid of genotype AaBb.

Front 10

dominant allele

Back 10

An allele that is fully expressed in the phenotype of a heterozygote.