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Punnett Squares

Punnett Squares. The chart that makes a difference. . What is a Punnett Square?. A p unnet s quare is a chart that will show all the possible combinations of alleles that can result from a genetic cross. This punnett square shows t he possible outcomes of a bean plant.

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Punnett Squares

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  1. Punnett Squares The chart that makes a difference.

  2. What is a Punnett Square? A punnetsquare is a chart that will show all the possible combinations of alleles that can result from a genetic cross. This punnett square shows the possible outcomes of a bean plant.

  3. How Do We Read the Punnett Square? In the punnett square, you will often see an uppercase letter and a lowercase letter. The uppercase letter represents the dominant allele, and the lowercase represents the recessive allele. G- Dominant Trait g- Recessive Trait

  4. How Do We Make a Punnett Square? • First, make a square box with four quadrants.

  5. How Do You Make a Punnett Square? a Then, label the male alleles on the top of the square, and the female alleles on the side. A A Red – male Orange- female a

  6. How Do We Make a Punnett Square After that, copy the female parent’s alleles onto the right side of each quadrant.(Note; If the female gene is recessive, the dominant allele will be placed before it.) A a A a

  7. How Do We Make a Punnett Square? Finally, copy the male parent’s alleles beside the female alleles. Remember always to put the dominant allele before the recessive allele. A a A a

  8. How Do We Read The Punnett Square? This punnett square represents the possible outcomes between the pistil and pollen plants. It shows that one in four offspring (25%) will be a white flower. It’s also the other way around, meaning 3 in 4(75%) of offsprings will be purple.

  9. How Do We Read a Punnett Square? Now You Try! • What is the probability that a plant will be a yellow pea? • What is the probability that that pea will be green? • What is the dominant gene? Recessive gene?

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