lab 6 Flashcards
what plant are we using in this lab?
Wisconsin fast plants
wisconsin fast plants are a variety of…
Brassica rapa
pollination of Brassica rapa flowers in nature
insects, primarily bees
pollination of Wisconsin fast plants indoors
hand pollinated
how many hours will we grow the seeds
48
what family is Brassica rapa a member of
common garden vegetables such as radish, mustard, cabbage, and cauliflower
reproductive parts of the plant
flowers
fertilization
pollen transferred from one plant to another
hybrid
plant that results from cross between 2 parent plants with different genetic types
monohybrids
if parent plants differ in just 1 set of contrasting phenotypes
dihybrids
if parent plants differ in just 2 sets of contrasting phenotypes
what generation of seeds will we be given in lab
F2
is lab a dihybrid or monohybrid cross
dihybrid
possible phenotypes in lab
- long stem : short stem (Rosette-dwarf)
-Purple stem : non-purple stem
how far apart are unlinked genes
50 mu
how are we expecting each phenotype pair to segregate
3/4 dominant
1/4 recessive
what ratio is typical of dihybrid cross
9:3:3:1
are long or short stems dominant
long
are purple or non-purple stems dominant
purple
what analysis are we using at the end
chi-square
any variations of observed results from expected results are due to __________
chance (null chance hypothesis)
chi-square test
how well observed ratios fit expected ratios
formula for chi-square
sum of (obs-exp)^2 / exp
degrees of freedom
one less than number of dif phenotypes possilbe
if percent variation of observed results from expected results is greater than 0.5, what do we accept?
null hypothesis
