Part H: Lecture 20

Question 1

sex-linked gene (def.)

Answer 1

gene on a sex chromosome

Question 2

X-linked gene (def.)

Answer 2

gene on the X-chromosome

Question 3

most genes on X are ___

Answer 3

regular genes and not involved in sex determination or dosage compensation (ex. blood clotting factor IX)

Question 4

X-linked genes: females are ___ or ____

Answer 4

homozygous or heterozygous

Question 5

X-linked genes: male are ___

Answer 5

hemizygous

Question 6

X-linked gene: nomenclature

Answer 6

superscript: XA/Xa or A/a
non-superscript: XA/Y or A/Y

Question 7

drosophila white gene is on ___

Answer 7

X chromosome

Question 8

chromosomal theory of inheritance states that

Answer 8

chromosomes are where the genes are

Question 9

cat coat colour: orange gene is on ___

Answer 9

X chromosome

Question 10

cat coat colour: orange gene alleles

Answer 10

Oo = orange
OB= black

Question 11

cat coat colour: orange gene allele interaction

Answer 11

co-dominance

Question 12

cat coat colour: mosaic colour mechanism

Answer 12

-inactive and active X chr with O or B alleles

Question 13

cat coat colour: S gene is on ___

Answer 13

autosome

Question 14

cat coat colour: S gene : S allele

Answer 14

white patches

Question 15

cat coat colour: S gene: s allele

Answer 15

no white patches

Question 16

tortoiseshell (black/orange) and calico (black/orange/white)cats are usually ____

Answer 16

female

Question 17

Z-linked gene example

Answer 17

Turkey E gene

Question 18

Turkey E gene: E allele

Answer 18

bronze

Question 19

Turkey E gene: e allele

Answer 19

brown

Question 20

bird sex determination + (similar to ___)

Answer 20

Two Z = male
One Z = female
DMRT1 gene on Z chromosome
flies

Question 21

Bird dosage compensation

Answer 21

increase Z linked gene activity in females

Question 22

Sex influenced traits (def.)

Answer 22

phenotypes that differ in males and females but are due to sex hormones and autosomal genes not sex chromosomes

Question 23

female flies heterozygous for X-linked gene have ___ phenotype because ___

Answer 23

uniform
DC= increase activity in males

Question 24

female mammals heterozygous for X-linked gene have ___ phenotype because ___

Answer 24

mosaic
DC= X chr inactivation