Flashcards in CH15 Deck (17):
define wild type
The phenotype for a character most commonly observed in natural populations
Sex linked genes
a gene located on either sex chr
define barr body
The inactive X in each cell of a female condenses into a compact object
Define linked genes
Genes located on the same chr or near each other on the same chr
Define Parental types
when an offspring shares the same phenotype of a parent.
When two non parental phenotypes are found in an offspring
define Linkage map
A genetic map based on recombination frequencies
Drawing a chr and placing specific genes
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
not true sets of chr.
2n - 1 chr
2n + 1
Occurs when a chromosomal fragment is lost
where the deleted fragment may become attached as an extra segment to a sister chromatid
A chromosomal fragment may also reattach to the original chr but in reverse orientation
Define reciprocal translocation
where a chromosomal breakage is for the fragment to join a nonhomologous chr
Define Down Syndrome
This is an aneuploid condition. occurs in 1/830 children born.
Is usually an extra 21 chr. 47 total chr.