It's Hip to be a Punnett Square - Honors Classwork Solutions

Hi Everyone,

Great work today in the new classes - I think they will work out well!

Here are the solutions to the handout from class:

Front Page (Level I questions...)

1. Genotypes: 2Gg, 2gg, Phenotypes are 50% green, 50% yellow
2. Genotypes: 2TT, 2Tt, Phenotypes are 100% tall
3. Genotypes: 2Tt, 2tt, Phenotypes are 50% tall, 50% short.
4. Genotypes: 2 Rr, 2rr, Phenotypes are 50% red, 50% white
5. Genotypes are all rr, Phenotypes are 100% white
6. Genotypes are all BB, Phenotypes are 100% black chicken.

Back page problems (Level II)
1. B is brown, b is tan. The cross is BB x Bb.
Genotypes: BB, Bb, BB, Bb, Phenotype is 100% brown mouse.

2. W is white, w is brown. The cross is Bb x Bb.
Genotypes: BB, Bb, Bb, bb, Phenotype is 75% white, and 25% brown.

3. R is red, r is white. The cross is Rr x Rr.
Genotypes: RR, Rr, Rr, rr, Phenotype is 75% red, 25% white.

4. T is tall, t is short. The cross is TT x Tt.
Genotypes: TT, Tt, TT, Tt, Phenotype is 100% tall plant.

5. Period 3 - note the following fact pointed out by someone in the 4th period class: Since it says the white rabbit is heterozygous, this means that WHITE is dominant (not black). If W is white and w is black, then the cross is Ww x ww.

Genotypes: Ww, Ww, ww, ww, Phenotype is 50% white, 50% black.

The secret phrase for today - independent assortment. Extra bonus to those that figure out how this relates to today's lesson....