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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Jess8219 Jess8219
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3 years ago
Topic: Working with Punnet Squares/Genetic Crosses
Q; The allele for long wings is dominant to the allele for curly wings in fruit flies. Predict the genotypes and phenotypes of the offspring resulting from a cross between two fruit flies heterozygous for wing shape.
I have some difficulties with punnet squares, can you go over each step? Thank you.
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#1
Educator
3 years ago
R r is heterozygous

---R  r
R  RR  Rr
r    Rr   rr

So the phenotype will be 3 long wing and 1 short
The genotypes are 1:2:1 -- RR: Rr: rr
Jess8219 Author
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#2
3 years ago
do you mind showing that through a sketch, like a punnet square form? its a lot easier to understand.
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bio_manbio_man
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#3
Educator
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3 years ago
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Jess8219 Author
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#4
3 years ago
The 2 Rr above the punnet square represents the 2 parents that are heterozygous? and the phenotype ratio would be 3:1?
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#5
Educator
3 years ago
Yes, the phenotype is 3 to 1.

The parents are written in blue, offspring are in red
Jess8219 Author
wrote...
#6
3 years ago
thanks
wrote...
#7
Educator
3 years ago
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