Punett Square Help!!!!

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Jason123456
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Punett Square Help!!!!

Post by Jason123456 » Mon Nov 19, 2007 3:31 am

I would appreciate any help with this.

On Venus, Blue skin is compltely dominant (B), and green skin is recessive(b). Also, pointed ears are completely dominant(P), and blunt ears are recessive(p). A male Venusian who is heterozygous for BOTH skin color and ear shape mates with a female Venusian who is homozygous dominant for skin color and heterozygous for ear shape.

A: What gametes (the genotypes) are produced by the male?

B: what gametes (the genotypes) are produced by the female?

and c: using a 4x4 punett square, what are the genotypes of the offspring?


Thanks again!!!

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mith
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Post by mith » Mon Nov 19, 2007 3:36 am

Write out their genotypes and you should get your answer pretty easily.
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Post by Jason123456 » Mon Nov 19, 2007 3:40 am

mith wrote:Write out their genotypes and you should get your answer pretty easily.



With all due respect, if I could get the answer I wouldn't have asked.

BbPp and BBPp are the genotypes.. I don't know how to make a punett sqaure so it's not exactly easy for me to do this problem.

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Post by mith » Mon Nov 19, 2007 4:17 am

You could do a forum search, there's more than 3 worked out examples(including trihybrid crosses)
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Post by Jason123456 » Mon Nov 19, 2007 4:39 am

mith wrote:You could do a forum search, there's more than 3 worked out examples(including trihybrid crosses)


All the examples I am seeing on the internet use a mother and father with the same RrYy genotype. Where is the link to the dihybrid cross? Can't seem to find it. I did find some simple 2x2 punett squares, but they are of no help. I need to create a punett square using BbPp x BBPp

What I am looking for is what would go on the X axis and what would go on the Y axis? I could figure it out if I knew that.

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Post by Jason123456 » Mon Nov 19, 2007 5:31 am

Awesome.. I just found a punett square calculator

I don't have 5 posts yet so I can't share.. sorry

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Post by Jason123456 » Mon Nov 19, 2007 5:32 am

Jason123456 wrote:Awesome.. I just found a punett square calculator

I don't have 5 posts yet so I can't share.. sorry

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Post by Jason123456 » Mon Nov 19, 2007 5:33 am

there ya go, just in case anyone else wants to play around with it.


http://www.changbioscience.com/genetics/punnett.html

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Post by mith » Mon Nov 19, 2007 4:17 pm

viewtopic.php?t=10756&highlight=dihybrid+cross

Well, if you already found hetero X hetero, you could just replace one of the sides with your homozygote and redo the calculation.
Living one day at a time;
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