## Genetic Question help?

**Moderator:** BioTeam

### Genetic Question help?

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?

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?

### Re: Genetic Question help?

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

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

### Re: Genetic Question help?

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

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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