Chapter 4 lecture Flashcards
Who put gene on chromosomes
Thomas Morgan
What causes embryonic gonads to become male
SRY teste determination factor
how is a meta female fly created
3 X /2 Autosomal
how is a female fly made
2 X/ 2 autosomal
intersex fly created
2 x/ 3 autosomal
male fly
1 x/ 2 autosomal
Metamale fly
1 X/ 3 autosomal
nondisjunctio
no separation of chromosomes
What causes Down syndrome
21 chromosome nondisjuction
Turners sysndome is caused how
1 x chromosome
how is kleinfield syndrome caused
XXY
What is a Barr body
inactive X
How do male flys cope with 1 X
X works 2X harder
What is det^+det^+
Homozygous dominate and Wild Type
What is det^+det
Heterozygous
what is detdet
homozygous recessive and double mutant
What is A+A+
homozygous dominant and double mutant
A+a
heterozygous
What is AA
Wild type homozygous recessive
If red eye female mates with white eye male what is the F1 and F2 considering Eye color is on x chromosome
F1 All males and females red eyes
F2 All females red and 1/2 red eye male/ and 1/2 white eye male
If white eye female mates with red eye male what is the F1 and F2 considering Eye color is on x chromosome
F1 all red eye female and all white eye male
F2 1/2 red and 1/2 white eye female and 1/2 red and 1/2 white eye male
What are 2 examples of X-linked traits
hemophila and colorblindness
What is a sex linked trait
any gene found on X
how do sex chromosome know they are homologus
pseudoautosomal points
sex limited traits and example
expressed in 1 sex
milk production
sex influnced traits and examples
more frequent in 1 sex than other
baldness
What does it mean in corn
P is white kernel and white kernel
F1 is Purple kernels
F2 9 purple kernels and 7 white kernels
complementary gene interaction
What does it mean in mice
P is black and albino
F1 is agouti
F2 9 agouti 3 black 4 albino
epistasis need one gene to have color other wise one gene will be masked even if its dominant
how does DNA becomes phenotype
DNA —> RNA —> Protein —> enzyme
what is the recessive gene
inactive enzyme
Who found 1 gene 1 enzyme hypothesis
Beadle and tatum
1 gene 1 enzyme hypothesis
1 gene codes for 1 enzyme but may also code for structural protein
explain a biochemical pathway
X—> O1 —> O2 —> O3 —> pigment
. G1 G2 G3 G4
. most dangerous mutant least dangerous mutant
Complementation
2 different genes will complement each other and 2 mutation occur in different genes
If 2 mutant white flowers produce a white flower what does that mean
the do no complement each other and the 2 mutations occur on same gene
If 2 mutant white flowers produce a red flower what does that mean
the do complement each other and the 2 mutations occur on different genes
using reciprocal crosses which help += complement
- =does not complement. the complement groups are?
. 1 2 3 4 5
1 - + - +
2 + - +
3 + +
4 +
group 1: 1,2,4
group 2: 3
group 3: 5
