Question

In a dihybrid cross between RrTt and RRtt, what are the genotype and phenotype ratios of the offspring, assuming R and T are dominant? R codes for round seed, while r codes for wrinkled seed. T codes for tall height, while t codes for short height. (Show your Punnett Square)

Answer 1

Well you can say the genotypes of the following offspring are: RT, rt, Rt, Rt.
From there, you can make your punnett square utilising these genotypes in which you can determined the phenotypes as well.

Answer 2

thanks for that, so i did the punnett square, im stuck with the phenotype

Answer 3

i got the ratio to be 1:1:1:1

Answer 4

hi kene..do u still need help or u got the ans?

Answer 5

yes!!! lol

Answer 6

yes what? yes u got d ans or yes u need help..lol:P

Answer 7

yes i need help pleaseeee

Answer 8

:) thanks

Answer 9

okay sure...so can u tell me d gametes of both the parents? can u show me how u drew d punnet?

Answer 10

how can i show u what u drew?
lol

Answer 11

did u get this?

Answer 12

i got this lol, im pretty lost so if im wrong im not surprised

Answer 13

i send you a picture of what i did

Answer 14

yep u r right...its just that i wrote Rt only once..while u wrote it 4 times...actually u need not write it 4 times....so eventually u get the genotypic and phenotypic ratio as 1:1:1:1

Answer 15

really? so i would only write it once?

Answer 16

if the ratio is 1:1:1:1- is that the same as the phenotype
?

Answer 17

yep....u write the phenotype of every gentoype then u will find out it comes to 1:1:1:1

Answer 18

can u complete this?

Answer 19

oh i see!!

Answer 20

Red-green colorblindness is an X-linked recessive mutation. A colorblind female is crossed with a normal male. What are the parental genotypes? Diagram the F1 results from this cross. (show punnett square). Diagram the F2 results. (show the punnett square).

Answer 21

whoops i wrote wrong..i meant phenotypic ratio is !:1

Answer 22

so pheno is 1:1? and geno is 1:1:1:1??

Answer 23

yep..:)

Answer 24

ok thankssss

Answer 25

happy 2 help:D

Answer 26

can you help me with one more?

Answer 27

yes sure....

Answer 28

can u tell me d genotype of the parents?

Answer 29

Xc Xc XCY ?

Answer 30

yep..u r absolutely write...its just that u dont need to write XCY...U Can write it as XY

Answer 31

So now show me d punnet...actually u know wat...u seem good at this...:)

Answer 32

lol i dont think so

Answer 33

but thanks

Answer 34

yep...believe me...i have helped a lot of people wid punnets....u seem good at it...

Answer 35

can u draw it how i drew earlier...use d draw tool below...

Answer 36

i have trouble with the F1 and F2 punnets

Answer 37

ill help u out..dont worry wid dat...ok ill guide u a lil...i will draw d punnet u fill in the squares ok?

Answer 38

ok

Answer 39

XXc Yxc

Answer 40

absolutely right..:) so can u tell me d phenotype of them?

Answer 41

im lost haha

Answer 42

so this is where im confused at, the punnet i just filled out that is for f1? and what do i do for F2 bc thats the offspring right?

Answer 43

okay np...see they have given colour blindness is recessive...so for a female to have colourblindness both the X should be xcxc correct?
while for a man..there is only 1 X in his genotype..right?
so if that 1 X is xc then he has colourblindness...ok?

Answer 44

ok

Answer 45

so now the boy with xcY would have colorblindness..rite?

Answer 46

and d girl Xxc would be normal....ok? with me so far?

Answer 47

yes because the man has the colournlindness

Answer 48

cool...now in humans u lnow that u need a man and a women to get offsprings....and u have got both in the F1 cross...so take both of them find gametes and draw a punnet like we did earlier...

Answer 49

ok

Answer 50

so all clear? hope this helped..
and i see dat u r new to this site so i would suggest u to take a look at d code of conduct...:D

Answer 51

http://openstudy.com/code-of-conduct
happy studying..:D