Punnett+Square++Worksheet

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Louisiana State University *

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4030

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Dec 6, 2023

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Name ___________________ Date______________ Punnett Square Worksheet You will be filling in the Punnett squares from the scenarios given in Mendel’s original work. You will also tell the percent of the phenotypes (what they look like) of the offspring after doing the square. Remember the Punnett Square steps. STEP 1: Determine what kind of problem you are trying to solve. STEP 2: Determine letters you will use to specify traits. STEP 3: Determine parent’s genotypes. STEP 4: Make your Punnett square and make gametes. STEP 5: Complete cross and determine possible offspring. STEP 6: Determine genotypic and phenotypic ratios. Monohybrid Cross Example - Yellow seeds are dominant over green seeds in pea plants. One parent plant is homozygous green (yy), and the other parent plant is homozygous yellow (YY). Fill in the Punnett square and tell how many offspring will be yellow and how many will be green. (You don’t have to use color – this was to help you see the differences). Remember that each square represents 25%. y y Y Y y Y y Y Y y Y y Offspring phenotype: Yellow 100% Green 0%

1. Green pod color is dominant over yellow pod color in pea plants. One parent plant is homozygous green (GG), and the other parent plant is heterozygous green (Gg). Fill in the Punnett square and tell how many offspring will be yellow and how many will be green. (5 points) Offspring phenotype: Green _____________ Yellow _____________ 2. Round seeds are dominant over wrinkled seeds in pea plants. One parent plant is homozygous wrinkled (rr), and the other parent plant is heterozygous round (Rr). Fill in the Punnett square and tell how many offspring will be round and how many will be wrinkled. (5 points) Offspring phenotype: Round _____________ Wrinkled ___________

3. Tall pea plants are dominant over short pea plants. Both parent plants are heterozygous tall (Tt) and (Tt). Fill in the Punnett square and tell how many offspring will be tall and how many will be short. (5 points) Offspring phenotype: Tall _____________ Short _____________ 4. Gray seed coat color is dominant over white seed coat color. One parent plant is homozygous gray (GG), and the other parent plant is homozygous gray (GG). Fill in the Punnett square and tell how many offspring will be gray and how many will be white. (5 points) Offspring phenotype: Gray _____________ White _____________

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5. Tall pea plants are dominant over short pea plants. Both parent plants are homozygous short (tt) and (tt). Fill in the Punnett square and tell how many offspring will be tall and how many will be short. (5 points) Offspring phenotype: Tall _____________ Short _____________

Dihybrid Cross Example - A tall green pea plant that is homozygous dominant for both traits is crossed with a short yellow pea plant that is homozygous recessive for both traits. Fill in the Punnett square and tell how many offspring will be yellow and green and how many will be short and tall. (10 points) Parent 1 Genotype: TTGG Parent 2 Genotype: ttgg FOIL to determine gametes: T T G G t t g g Parent 1 gametes: TG, TG, TG, TG Parent 2 gametes: tg, tg, tg, tg X TG TG TG TG t g TtGg TtGg TtGg TtGg t g TtGg TtGg TtGg TtGg t g TtGg TtGg TtGg TtGg t g TtGg TtGg TtGg TtGg Offspring phenotype ratios: Tall/Green _16/16__: Tall/Yellow _0/16__: Short/Green _0/16__: Short/Yellow _0/16__

6. A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. Fill in the Punnett square and tell how many offspring will be in the various genotypes and phenotypes. (35 points) X Parent 1 genotype: Parent 2 genotype: FOIL to determine gametes: Parent 1 gametes: Parent 2 gametes: Offspring phenotype ratios:

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Incomplete Dominance 7. In mice, coat color is incompletely dominant. Yellow (Y) and white (W) colored mice are homozygous, while cream (YW) colored mice are heterozygous. If two cream-colored mice mate, what percentage of each phenotype is probable of their offspring? Fill in the Punnett Square. (10 points) Offspring phenotype: Yellow: _____ White: _____ Cream: _____ Co-dominance 8. In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspring are roan (RW)—a spotted, red, and white or milky red color. What offspring are expected from mating a roan bull and a roan cow? Fill in the Punnett Square. (10 points) Offspring phenotype: Red: _____ White: _____ Roan: _____

Multiple Alleles 9. In humans, there are four types of blood; type A, type B, type AB, and type O. The alleles A and B are codominant to each other, and the O allele is recessive to both A and B alleles. So a person with the genotype AA or AO will have A type of blood. If you are type O and marry a person with blood type AB, what are the possible blood phenotypes of your children? (10 points) Fill in the Punnett Square. Offspring phenotype: A: _____ B: _____ AB:_____ O:_____ Conclusion 10. What is the function of a Punnett Square? Use 2 to 3 sentences to answer the question and use your best grammar. (10 points)

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