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Punnett Square practice Problems

Punnett Square practice Problems - Name_Date_Period...

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Name ______________________________________________ Date_______________ Period __________ P UNNETT  S QUARE  P RACTICE  P ROBLEMS Remember:  Homozygous  means both  alleles  are the SAME (PP, pp, SS, etc.).  Heterozygous  means both  alleles  are DIFFERENT (Pp, Ss, Rr, etc.). SOLVE THESE PROBLEMS ON YOUR OWN PAPER!  SHOW ALL  WORK, AND CIRCLE  YOUR  ANSWER! 1. In fruit flies, long wings (L) are dominant over short wings (l). a. What is the genotype  of a heterozygous long-winged fly? b. What is the genotype  of a short-winged fly? c. What is the genotype  of a homozygous long-winged fly? 2. What is the phenotype  of: a. LL b.  Ll c.  Ll 3. If two fruit flies breed and produce long-winged and short-winged offspring in approximately a 3:1  ratio, what is probably the genotype  of the parents?  Prove your answer with a Punnett square. 4. If a long-winged fly and a short-winged fly produce offspring in the approximate ratio of 1 long-winged 
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