Punnett+Square++Worksheet

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School

Louisiana State University *

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Course

4030

Subject

Biology

Date

Dec 6, 2023

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pdf

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8

Uploaded by BrigadierTurtle17957

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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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