How do you find a percentage from a Punnett square?

A Punnett square has 4 boxes, so each box is a 1/4 chance, or 25%. Count the boxes that show the trait. Three boxes out of 4 is 3/4, or 75%.

What ratio does a Tt × Tt cross give?

It gives 1 TT, 2 Tt and 1 tt, which is 3 tall to 1 short, a 3:1 ratio, on the example at the top of Punnett Squares.

6th Grade Punnett Squares Worksheets

Ages 11-12 · Free previews · Print-ready PDFs

Written by Adi Ackerman, Head Teacher

A Punnett square shows every way the alleles from two parents can combine, so it predicts the chance of each trait in their offspring. These two 6th grade worksheets, each with an answer key, move from filling in squares to probability. Punnett Squares works four crosses for purple and white after a tall and short example, and Punnett Square Probability uses guinea pigs, rabbits, freckles and pea plants. The sheets practice MS-LS3-2.

6th Grade Science Living Things Punnett squares Clear All

Punnett Square Probability

Grade6th Grade

TopicLiving Things

Punnett Squares

Grade6th Grade

TopicLiving Things

More living things worksheets

Explore all of our 6th grade living things worksheets, covering cells, from cells to organisms, human body systems, heredity, and more.

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Frequently Asked Questions

Write the first parent's alleles across the top and the second parent's down the side. Each box gets the letter above it and the letter beside it. Any offspring with at least one dominant allele shows the dominant trait.

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