Ap Biology (The Chromosomal Basis Of Inheritance: 15.4-5)

Front 1

Nondisjunction

Back 1

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

Front 2

Aneuploidy

Back 2

The situation in which the phenotypes of both alleles are exhibited in the heterozygote.

Front 3

Trisomic

Back 3

The situation in which the phenotype of heterozygotes is intermediate between the phenotypes of individuals homozygous for either allele

Front 4

Monosomic

Back 4

Referring to a cell that has only one copy of a particular chromosome, instead of the normal two.

Front 5

Polyploidy

Back 5

A chromosomal alteration in which the organism posses more than two complete chromosome sets.

Front 6

Deletion

Back 6

A type of gene interaction in which one gene alters the phenotype efforts of another gene that is independently inherited.

Front 7

Quantitative Characters

Back 7

An aberration in chromosome structure due to fusion with a fragment from a homologous chromosome, such that a portion of a chromosome is duplicated.

Front 8

Polygenic Inheritance

Back 8

An aberration in chromosome structure resulting from reattachment in a revers orientation of a chromosomal fragment to the chromosome from which the fragment originated.

Front 9

Norm of Reaction

Back 9

(1) An aberration in chromosome structure resulting from attachment to of a chromosomal fragment to a nonhomologous chromosome. (2) During protein synthesis, the third stage in the elongation cycle when the RNA carrying the growing polypeptide moves form the A site to the Psite on the ribosome. (3) The transport of organic nutrients in the phloem of vascular plants.

Front 10

Multifactorial

Back 10

A human genetic disease caused by presence of an extra chromosome 21; characterized by mental retardation and heart and respiratory defects.

Front 11

Genomic Imprinting

Back 11

Phenomenon in which expression of an allele in offspring depends on whether the allele is inherited from the male or female parent.