Question

Punnett squares

Answer 1

Draw a Punnett square in your assignment worksheet that shows the results of a cross between a homozygous red bull (RR) and a heterozygous red cow (Rr). Be certain to title your Punnett square and indicate each parent.

Answer 2

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Answer 3

I've gotten everything except "Be certain to title your Punnett square and indicate each parent."

Answer 4

Genotypic ratio:
phenotypic ratio:

Answer 5

How would i get the ratios?

Answer 6

Rr = red cow RR = red bull

Answer 7

Oh

Answer 8

http://sctritonscience.com/Wilson/biology_punnett_squares.htm

STEP 1: Determine what kind of problem you are trying to solve.

Does it involve simple dominant and recessive traits, Incomplete dominance, or Co-dominance?

Is it a monohybrid or dihyrid?

In this case there is only one trait..........this is a monohybrid cross involving dominant and recessive traits.

STEP 2: Determine letters you will use to specify traits.

In this case it is dominant and recessive, so you can use T and t.

STEP 3: Determine parents genotypes.

In this case you were told the parents were heterozygous. You therefore know that the parents must be Tt and Tt

The Cross is: Tt X Tt

STEP 4: Make your punnet square and make gametes (these go on the top and side of your punnett square.

Tt would make a T and a t

STEP 5: Complete cross and determine possible offspring.

STEP 6: Determine genotypic and phenotypic ratios.

Genotypic ratio: Make a list of all the different genotypes (the letter combinations) and determine how many of each you have.

In your problem this would be: TT = 1, Tt = 2, and tt - 1. The genotypic ratio would therefore be 1 : 2 : 1

Phenotypic ratio: Make a list of all the different phenotypes (physical characteristics.

In you problem this would be: Tall = 3, and short = 1. The phenotypic ratio would therefore be 3 : 1

Answer 9

Okay, that was helpful. So the geno ratio would be 2:2

Answer 10

And WAY shorter than the last explanation XD

Answer 11

Yes, and the pheno would be easier to find. the pheno ratio would be 2:1

Answer 12

Thanks for that!

Answer 13

no problem