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what do u think the answer is ?
do you know what a punnet square is?
do you know how to make a punnet square of a dihybrid cross?
I very vaguely know how to make it :(
okey here is an example:
Yeah I know what it looks like and stuff
It's pretty much just finding the probabilities that trips me up
So it would be PT pT pT and pt?
the number of times a genotype shows up in the square devided by the total number of squares is the probability of a certain genotype
o sorry no it is PT, PT, pT and pT. No pt
for PpTT parent it would be PT and pT for ppTt ------> pT and pt Now it's just the matter of punnet square
because there is no little t in the starting genotype
Okay so it is PT, PT, pT, and pT?
oh hehe i think I understood you wrong I thought you meant on one side... you are right no problem
so now what do I do?
one side has PT and pT and the other has pT and pt
you draw a square like that and you fill up the square combining the 2 genotypes (so the top left one is PpTT)
THe next one would be PpTt? @ niels5x9
So now what we just fill in the rest of the square?
okay so all of them together are PpTT, PpTt, ppTt and ppTT?
and then we can go on to determine the likelyhood of every genotype: the genotypes we have are: PpTT PpTt ppTT pptT the total number of genotypes is four and every genotype comes up one time. what do you think is the probability of every genotype showing up?
yes is is
magnificent. now for the last question do you know what dominent and resisive means?
*dominant and ressesive exuse my english
when you have two genes in a pair one can be dominant over another, like P is dominant over p. that means that if you have the genotype Pp your fenotype will be P and not p. p is the ressesive gene here. do you understand?
okey you have two genes P and p. some people have PP, they will have a fenotype P. some people have pp, they will have a fenotype p. But an organism can have only one fenotype so one should be dominant over another meaning that in case of Pp one should come out as the phenotype.
So if it is Pp it will be purple but if it is pp it will be white?
yeah PP also means that its purple.
a lot of genetic disorders are also recessive and that means that somebody can have one of the genes for the disease but not notice it, but when they have children with another person with one gene of the disease their child might get the dissease.
so getting back to the exersize, you now work out what the fenotype of those 4 genotypes is
How do I do that?
okey so in the first one: PpTT in Pp P is dominant so phenotype: P in TT: T so the phenotype is: TP
Well I know no matter what it will be a tall plant right?
So in the second one it will be purple and tall
yes it will
the third white and tall and in the last white and tall?
so really there is a 50% chance that it will be purple or white right?
now what do you think is the next step in getting the chance in phenotype
sorry i was distracted yes it is!!
SO are we done then?
so now you have all the questions answered
Yeah it might be but you've done a good job..! Bravo!