anonymous
  • anonymous
In pea plants, purple flowers (P) are dominant over white flowers (p) and tall stems (T) are dominant over short stems (t). Complete a dihybrid cross for parents with the genotypes: PpTT × ppTt and answer the following in complete sentences. Describe how you would set up a Punnett square for this cross. List the likelihood of each possible offspring genotype. List the likelihood of each possible offspring phenotype. @niels5x9
Biology
jamiebookeater
  • jamiebookeater
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Rushwr
  • Rushwr
what do u think the answer is ?
anonymous
  • anonymous
@Rushwr I honestly don't know
anonymous
  • anonymous
do you know what a punnet square is?

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anonymous
  • anonymous
@niels5x9 yes I do know what a punnet square is
anonymous
  • anonymous
do you know how to make a punnet square of a dihybrid cross?
anonymous
  • anonymous
I very vaguely know how to make it :(
anonymous
  • anonymous
okey here is an example:
shreehari499
  • shreehari499
Cool @niels you are there... ,I'll leave
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
Yeah I know what it looks like and stuff
Rushwr
  • Rushwr
@Devingee23 1st u would have to write down the gametes for each parent.
anonymous
  • anonymous
It's pretty much just finding the probabilities that trips me up
anonymous
  • anonymous
okey
anonymous
  • anonymous
So it would be PT pT pT and pt?
anonymous
  • anonymous
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
anonymous
  • anonymous
So I had it right? for that part @niels5x9
anonymous
  • anonymous
o sorry no it is PT, PT, pT and pT. No pt
Rushwr
  • Rushwr
for PpTT parent it would be PT and pT for ppTt ------> pT and pt Now it's just the matter of punnet square
anonymous
  • anonymous
because there is no little t in the starting genotype
anonymous
  • anonymous
Okay so it is PT, PT, pT, and pT?
anonymous
  • anonymous
oh hehe i think I understood you wrong I thought you meant on one side... you are right no problem
anonymous
  • anonymous
so now what do I do?
anonymous
  • anonymous
one side has PT and pT and the other has pT and pt
anonymous
  • anonymous
|dw:1439997452539:dw|
anonymous
  • anonymous
you draw a square like that and you fill up the square combining the 2 genotypes (so the top left one is PpTT)
anonymous
  • anonymous
THe next one would be PpTt? @ niels5x9
anonymous
  • anonymous
exactly!! great
anonymous
  • anonymous
So now what we just fill in the rest of the square?
anonymous
  • anonymous
exactly
anonymous
  • anonymous
okay so all of them together are PpTT, PpTt, ppTt and ppTT?
anonymous
  • anonymous
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?
anonymous
  • anonymous
yes is is
anonymous
  • anonymous
25%?
anonymous
  • anonymous
magnificent. now for the last question do you know what dominent and resisive means?
anonymous
  • anonymous
I know for resecisve you have to have two of that one gene right? @niels5x9
anonymous
  • anonymous
*dominant and ressesive exuse my english
anonymous
  • anonymous
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?
anonymous
  • anonymous
KInd a
anonymous
  • anonymous
@ niels5x9
anonymous
  • anonymous
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.
Rushwr
  • Rushwr
anonymous
  • anonymous
So if it is Pp it will be purple but if it is pp it will be white?
anonymous
  • anonymous
exactly
Rushwr
  • Rushwr
yeah PP also means that its purple.
anonymous
  • anonymous
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.
anonymous
  • anonymous
now what?
anonymous
  • anonymous
so getting back to the exersize, you now work out what the fenotype of those 4 genotypes is
anonymous
  • anonymous
How do I do that?
anonymous
  • anonymous
okey so in the first one: PpTT in Pp P is dominant so phenotype: P in TT: T so the phenotype is: TP
anonymous
  • anonymous
Well I know no matter what it will be a tall plant right?
anonymous
  • anonymous
exactly!!
anonymous
  • anonymous
So in the second one it will be purple and tall
anonymous
  • anonymous
yes it will
anonymous
  • anonymous
the third white and tall and in the last white and tall?
anonymous
  • anonymous
yess certainly!!
anonymous
  • anonymous
so really there is a 50% chance that it will be purple or white right?
anonymous
  • anonymous
now what do you think is the next step in getting the chance in phenotype
anonymous
  • anonymous
?
anonymous
  • anonymous
WOuld it be 50% @niels5x9
anonymous
  • anonymous
@niels5x9 r u still there?
anonymous
  • anonymous
sorry i was distracted yes it is!!
anonymous
  • anonymous
SO are we done then?
anonymous
  • anonymous
so now you have all the questions answered
anonymous
  • anonymous
btw sorry @shreehari499 I just realised that this might have been more of your area of expertise.
shreehari499
  • shreehari499
Yeah it might be but you've done a good job..! Bravo!
anonymous
  • anonymous
thanks!!

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