Slideshow 5 and 6 Flashcards
conditional probability
calculated when the prob of an event is impacted by another
Dihybrid def
double heterozygote
symbolizing genes on same chromosome
Ry/rY
symbolizing genes on seperate chromosomes
R/r ; Y/y
symbolizing genes whose postion is unknown
R/r . Y/y
Mono hybrid cross
A/a x A/a
Di hybrid cross
A/a . R/r x A/a . R/r
Independent assortment
two genes on seperate chromosomes
Di hybrid cross with independent assortment ratio
9:3:3:1
Independent assortment principle only applies when what
when causative geners of interest are located on seperate chromosomes
Tetrahybrid cross
A/a;B/b;C/c;D/d X A/a;B/b;C/c;D/d
Dihybrid test cross is with a tester sooooo
A/a ; B/b X a/a ; b/b
Statistical analysis
perform a dihybrid cross, count of offspring pheneotypes, if 9;3;3;1 ratio then it supports independent assortment
Do we expect exactly 9 3 3 1 everytime
no
what test do we use?
x^2 test
what does the x2 test do
summarize the difference between observed data and expectated data in one number
what if p<.05
reject null
what if p>.05
support null hypothesis
discrete def
phenotypes fall into natural categoriesq
quantitative def
phenotype shows continuous variation
discrete vs quantitative ex
like toe number is descrete (5 or 6) and adult height is quantitative.
what determines quantitative traits value
variation at multiple genes.
also genetics AND environment
uniparental inheritance
genetic variation of one parent determines phenotype in offspring
paternal inheritance
genetic variation in the mal parent determines phenotype in offspring
