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aerodude30 aerodude30
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10 years ago
I have a homework question here that is confusing me
"In fruit flies the long L allele for wing length is dominant over the short l allele and grey bodied G is dominant over black g. For the two offspring phenotypic ratios below give the genotypes of the P generation

9:3:3:1 and 1:1:1:1 "

Any help would be much appreciated
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Donated
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10 years ago
Those phenotypic ratios are:

DD:Dr:rD:rr

This first one corresponds to a heterozygous parental cross of LlGg x LlGg
The second one corresponds to a parental cross of LlGg x llgg
Post Merge: 10 years ago

You sorta have to memorize that a heterozygous self-cross results in a 9:3:3:1 ratio (assuming no epistasis or other anomalies) and to get a 1:1:1:1 ratio, you have to have at least one homozygous recessive for both alleles and one heterozygous for both alleles.
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Pretty fly for a SciGuy
aerodude30 Author
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10 years ago
I can definitely see what your saying but what is the genotype of the P generation exactly? I understand the punnett square cross of it really well and how you got the 9:3:3:1 and 1:1:1:1 ratios would i just list all the answers in the punnett square?
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Doctor-2-BDoctor-2-B
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10 years ago
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Pretty fly for a SciGuy

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