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## Bio homework help

This is a discussion on Bio homework help within the General Off Topic+ forums, part of the QJ.net Forum Miscellaneous category; #7. so far i've figured out the percentage of offspring are of each type so that later on i could ...

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1. ## Bio homework help

#7. so far i've figured out the percentage of offspring are of each type so that later on i could work backwards to make a punnet square...44% are erminette, 28% are black and 28% are white. Have i done this correctly so far, if so can someone help me finish this?

2. Wow, its been a little over a year since Bio, and In Chemistry we don't go over this stuff.
But it looks good so far.

Let me keep looking at it.

EDIT: nope, look below...

3. F=white f=black

erminettes = Ff
black = ff
white = FF

Parents must be both heterogeneous or Ff

Am I wrong?

4. I would probably use B=black, W=white, so that

erminetes =BW since this is codominance.

Parents must be both heterogeneous or Ff
Ya thats a little obvious since it tells you they are erminette.

So if: B=black, W=white

P generation are BW

28% of offspring are BB, 22% of offspring are WW, and 44% are BW? This seems easier than i thought.

5. This was like 3 years ago for me, Physics has me disabled in most other sciences...sorry. If you had asked this question exactly 3 years ago, I would of known...

6. i think i've got it, thanks anyways.

7. I honestly learned this in my AP Biology class about 4-5 months ago. I remember a lot of this, and this is fresh in my memory. If you need help, just ask. ;)

Originally Posted by Frenchb0ygenius
P generation are BW

28% of offspring are BB, 22% of offspring are WW, and 44% are BW? This seems easier than i thought.
Where did you get those percentages from? Use a punett square. If both parents are BW (heterozygous):

BW x BW = BB, BW, BW, and WW.

In that case, two of the four F1 (1st filial) generation offspring would be 50% heterozygous (BW and BW), and 50% homozygous (WW and BB).

If codominance occurs, 50% of the offspring (BW and BW; erminette) are both black and white; 25% of the offspring are only white (WW); 25% of the offspring are only black (BB).

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