Part H: Lecture 20 Flashcards
sex-linked gene (def.)
gene on a sex chromosome
X-linked gene (def.)
gene on the X-chromosome
most genes on X are ___
regular genes and not involved in sex determination or dosage compensation (ex. blood clotting factor IX)
X-linked genes: females are ___ or ____
homozygous or heterozygous
X-linked genes: male are ___
hemizygous
X-linked gene: nomenclature
superscript: XA/Xa or A/a
non-superscript: XA/Y or A/Y
drosophila white gene is on ___
X chromosome
chromosomal theory of inheritance states that
chromosomes are where the genes are
cat coat colour: orange gene is on ___
X chromosome
cat coat colour: orange gene alleles
Oo = orange
OB= black
cat coat colour: orange gene allele interaction
co-dominance
cat coat colour: mosaic colour mechanism
-inactive and active X chr with O or B alleles
cat coat colour: S gene is on ___
autosome
cat coat colour: S gene : S allele
white patches
cat coat colour: S gene: s allele
no white patches
tortoiseshell (black/orange) and calico (black/orange/white)cats are usually ____
female
Z-linked gene example
Turkey E gene
Turkey E gene: E allele
bronze
Turkey E gene: e allele
brown
bird sex determination + (similar to ___)
Two Z = male
One Z = female
DMRT1 gene on Z chromosome
flies
Bird dosage compensation
increase Z linked gene activity in females
Sex influenced traits (def.)
phenotypes that differ in males and females but are due to sex hormones and autosomal genes not sex chromosomes
female flies heterozygous for X-linked gene have ___ phenotype because ___
uniform
DC= increase activity in males
female mammals heterozygous for X-linked gene have ___ phenotype because ___
mosaic
DC= X chr inactivation
