Punnett Square 2

What is a Punnet Square?

• Gregor Mendel's invention

• a diagram that is used to predict an outcome

  of a particular cross or breeding experiment.

• one type of experiment for genetics

• the exact outcome of two parents for a trait

What is the purpose of a Punnett Square?

• To analyze the DNA of an offspring based on a blood sample

• To analyze the chromosomes and the entire genome of an organism.

• To show cells dividing

• It helps determine the probability of offspring having a particular trait. It is used to represent all of the possible combinations of genes that could be inherited by the offspring of two parents.

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When using a Punnett Square, where are the genotypes of the parents written?

• The inside of the four squares

• The top and to the left of the four squares

• The top and to the right of the four squares

• Above and below the four squares

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The possible outcomes of a cross between two parents are placed where?

• On the outside of the Punnett Square

• one possibility goes inside each of the 4 boxes

• the all go in one box in the center

• above and to the left of the 4 boxes

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Since there are four boxes for the results of the cross, each box represents what percent chance for the offspring inheriting that genotype?

• 100%

• 10%

• 50%

• 25%

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What is the percent chance that the offspring will have purple flowers in this example?

• 25%

• 50%

• 75%

• 100%

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In this example, what is the percentage chance that the offspring will display the hidden recessive trait?

• 25%

• 50%

• 75%

• 100%

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For pea plants, tall pea plants are dominant to short pea plants. Is it possible that two parents who are both tall, have an offspring that is short?

• Yes, both parents would have to be heterozygous (Tt)

• Yes, both parents would have to be homozygous (TT)

• No, it is not possible

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Using the same height trait for pea plants, would it be possible for two short pea plants to have a tall pea plant offspring?

• Yes, if each short parent passed the dominant trait

• Yes, if one short parent passed the dominant trait

• No, each short parent only have recessive alleles to pass to the offspring

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One homozygous purple parent (PP) is crossed with a recessive white parent (pp) Is it possible that the offspring who will all be purple (Pp) have any white flowers in the next generation?

• No, the only the dominant P allele for purple flowers will be passed on

• Yes, if the other parent has a recessive allele to pass on as well, then there is a at least a 25% chance the "grandkids" will have white flowers

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