Monohybrid Crosses and Punnett Squares Punnett squares are diagrams that can be used to predict the offspring that could result from a combination of the gametes produced by two parents (or an organism that can self-fertilize). The alleles from the gametes of one parent (e.g., eggs) are placed on one axis of the Punnett square while the alleles from the gametes of the other parent (e.., sperm) are placed on the other axis. 1. Pea plants have two alleles for height: Tis the dominant allele and produces tall plants; t is the recessive allele and produces short plants. Consider two parental pea plants each have the genotype Tt and answer the following questions. a. What type of gametes can a plant with genotype Tt produce? b. Assign the maternal gametes to one axis in the Punnett square at right. c. Assign the paternal gametes to one axis in the Punnett square at right.

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Monohybrid Crosses and Punnett Squares
Punnett squares are diagrams that can be used to predict the offspring that could result from a combination
of the gametes produced by two parents (or an organism that can self-fertilize). The alleles from the
gametes of one parent (e.g., eggs) are placed on one axis of the Punnett square while the alleles from the
gametes of the other parent (e.g., sperm) are placed on the other axis.
1. Pea plants have two alleles for height: Tis the dominant allele and produces tall plants; t is the recessive
allele and produces short plants. Consider two parental pea plants each have the genotype Tt and
answer the following questions.
a. What type of gametes can a plant with genotype Tt produce?
b. Assign the maternal gametes to one axis in the Punnett square at right.
c. Assign the paternal gametes to one axis in the Punnett square at right.
2. Pea plants have two alleles for pea color: Y is the dominant allele and produces yellow peas; y is the
1
nment)
recessive allele and produces green peas. Consider two parental pea plants each have the genotype
Yy. Place the parental alleles on the axes of the Punnett square at right and fill in the boxes
corresponding to each offspring that would result from fertilization events between the parental
gametes.
a. Of the four possible offspring, how many would have the genotype YY?
b. Of the four possible offspring, how many would have the genotype Yy?
c. Of the four possible offspring, how many would have the genotype yy?
d. What is the probability of an offspring from this cross having yellow peas?
e. What is the probability of an offspring from this cross have green peas?
Transcribed Image Text:Monohybrid Crosses and Punnett Squares Punnett squares are diagrams that can be used to predict the offspring that could result from a combination of the gametes produced by two parents (or an organism that can self-fertilize). The alleles from the gametes of one parent (e.g., eggs) are placed on one axis of the Punnett square while the alleles from the gametes of the other parent (e.g., sperm) are placed on the other axis. 1. Pea plants have two alleles for height: Tis the dominant allele and produces tall plants; t is the recessive allele and produces short plants. Consider two parental pea plants each have the genotype Tt and answer the following questions. a. What type of gametes can a plant with genotype Tt produce? b. Assign the maternal gametes to one axis in the Punnett square at right. c. Assign the paternal gametes to one axis in the Punnett square at right. 2. Pea plants have two alleles for pea color: Y is the dominant allele and produces yellow peas; y is the 1 nment) recessive allele and produces green peas. Consider two parental pea plants each have the genotype Yy. Place the parental alleles on the axes of the Punnett square at right and fill in the boxes corresponding to each offspring that would result from fertilization events between the parental gametes. a. Of the four possible offspring, how many would have the genotype YY? b. Of the four possible offspring, how many would have the genotype Yy? c. Of the four possible offspring, how many would have the genotype yy? d. What is the probability of an offspring from this cross having yellow peas? e. What is the probability of an offspring from this cross have green peas?
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