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barry barry
wrote...
Posts: 11630
11 years ago
You have crossed two Mexican hairless dogs, and the offspring are 1/3 hairy and 2/3 hairless. Given this phenotypic ratio, draw the Punnett square for this cross. What are the genotypes of the P1 and F1 dogs in this cross? List the predicted genotype as well as the phenotype for each of the offspring. Which genotypes are hairless, and which are hairy? Can you design a genetic cross that would yield a true-breeding hairless line (where all offspring are hairless)?
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Staff Member
11 years ago
The 1:2 ratio in the offspring provides strong evidence that this trait involves a lethal allele. Thus the Punnett square for the cross would be

See attachment...

You cannot design a true-breeding cross, because the hh genotype is lethal. Thus a maximum of 2/3 of all of the offspring from any cross are predicted to be hairless.
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- Master of Science in Biology
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3 years ago
thank you
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Nic
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thank you brap hahahahhaa
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thank you
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Thx
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