Biology Forum › Genetics › Genetic Question help?
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- February 22, 2012 at 5:52 pm #16123
lyte22ParticipantHi i’ve been trying to work this question out but i’m getting kinda stuck..
The kernel on a cob can either be purple (dominant colour) or yellow (reccesive colour) or pink (intermediate colour). The colour purple is the product of a two step reaction with Pink being the intermediate product. You counted kernels on F2 cobs.
Questions:
1) How many purple Kernel would you expect to find
2) How many Pink Kernel would you expect to find
3) How many Yellow Kernel would you expect to find?
4) What colour would be the double homozygous recessive cob?
5) What colour would the F1 cob be? - February 22, 2012 at 6:14 pm #109808JackBeanParticipant
1-3) from 0 to 100% 🙄 unless you tell us more info, we can hardly guess
4) what is your opinion? That is not that hard, is it?
5) as 1-3
- February 22, 2012 at 6:22 pm #109809lyte22Participant
Lmao i forgot to the numbers!
its 1600 kernels on the F2 cob
For the answers 1-5 i could choose:
900, 800, yellow, pink and purple, purple, 300, 100 and 400 - February 22, 2012 at 11:03 pm #109817JackBeanParticipant
?
- February 23, 2012 at 12:15 pm #109835girlie21Participant
I KNOW I’VE BEEN ALSO STUCK ON EXACTLY THE SAME QUESTION!!
1. How many purple kernel would you expect to find?
2. How many pink kernel would you expect to find?
3. How many yellow kernel would you expect to find?
4. What colour would the double homozygous recessive cob be
5. What colour would the F1 cob be
900
800
100
PINK AND PURPLE
PINK
400
yellow
300
purple - February 24, 2012 at 10:25 am #109852JackBeanParticipant
that’s nice we know number of F2, but unless you tell us more about parents, we still can hardly guess
- March 1, 2012 at 4:04 am #109945sudeepaParticipant
There are two options either Dominant epistasis with ratio 12:3:1 or Recessive epistasis with ratio 9:3:4.
According to the options given it is Recessive epistasis. the ans are
1. How many purple kernel would you expect to find?
Ans. 900
2. How many pink kernel would you expect to find?
Ans. 300
3. How many yellow kernel would you expect to find?
Ans. 400
4. What colour would the double homozygous recessive cob be?
Ans. Yellow
5. What colour would the F1 cob be?
Ans. Purple
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