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Flashcards in CH15 Deck (17):
0

define wild type

The phenotype for a character most commonly observed in natural populations

1

Sex linked genes

a gene located on either sex chr

2

define barr body

The inactive X in each cell of a female condenses into a compact object

3

Define linked genes

Genes located on the same chr or near each other on the same chr

4

Define Parental types

when an offspring shares the same phenotype of a parent.

5

Define recombinant

When two non parental phenotypes are found in an offspring

6

define Linkage map

A genetic map based on recombination frequencies
Drawing a chr and placing specific genes

7

define nondisjunction

when the members of a pair of homologous chr do not move apart properly during meiosis I or sister chromatids fail to separate during meiosis II

8

define aneuploidy

not true sets of chr.

9

define Monosomic

2n - 1 chr

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define Trisomic

2n + 1

11

Define deletion

Occurs when a chromosomal fragment is lost

12

define Duplication

where the deleted fragment may become attached as an extra segment to a sister chromatid

13

define inversion

A chromosomal fragment may also reattach to the original chr but in reverse orientation

14

Define reciprocal translocation

where a chromosomal breakage is for the fragment to join a nonhomologous chr

15

Define Down Syndrome

This is an aneuploid condition. occurs in 1/830 children born.
Is usually an extra 21 chr. 47 total chr.

16

Define genomic imprinting

Variation in phenotype depending on whether an allele is inherited from the male or female