Biology Forum Genetics Genetic Question help?

4 voices
6 replies
• Author
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• #16123
lyte22
Participant

Hi 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?

• #109808
JackBean
Participant

1-3) from 0 to 100% ðŸ™„ 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

• #109809
lyte22
Participant

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

• #109817
JackBean
Participant

?

• #109835
girlie21
Participant

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

• #109852
JackBean
Participant

that’s nice we know number of F2, but unless you tell us more about parents, we still can hardly guess

• #109945
sudeepa
Participant

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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