Biology Forum › Genetics › Punett Square Help!!!!
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- November 19, 2007 at 3:31 am #8606
Jason123456ParticipantI 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 4×4 punett square, what are the genotypes of the offspring?
Thanks again!!!
- November 19, 2007 at 3:36 am #78007mithParticipant
Write out their genotypes and you should get your answer pretty easily.
- November 19, 2007 at 3:40 am #78009Jason123456Participantquote mith: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.
- November 19, 2007 at 4:17 am #78010mithParticipant
You could do a forum search, there’s more than 3 worked out examples(including trihybrid crosses)
- November 19, 2007 at 4:39 am #78011Jason123456Participantquote mith: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 2×2 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.
- November 19, 2007 at 5:31 am #78012Jason123456Participant
Awesome.. I just found a punett square calculator
I don’t have 5 posts yet so I can’t share.. sorry
- November 19, 2007 at 5:32 am #78013Jason123456Participantquote Jason123456:Awesome.. I just found a punett square calculator
I don’t have 5 posts yet so I can’t share.. sorry
- November 19, 2007 at 5:33 am #78014Jason123456Participant
there ya go, just in case anyone else wants to play around with it.
- November 19, 2007 at 4:17 pm #78033mithParticipant
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.
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