5. There is a helpful shortcut for calculating the probability of genotypes resulting from a dihybrid cross (or any cross considering two or more pairs of alleles) that does not require drawing a very large Punnett square. This is done by first determining the probabilities of each trait alone (using a monohybrid cross) and then using the multiplication rule to combine the probabilities of all the genotypes being considered. Using our TtYy plants above, we would first assign each set of alleles to its own Punnett square as follows: t Y y T TT Tt Y YY Yy t Tt tt y Yy yy a. Based on the Punnett squares above, what is the probability of being genotype tt in this cross? b. Based on the Punnett squares above, what is the probability of being genotype YY in this cross? c. Using the probabilities that you just calculated for the genotypes tt and YY, what is the probability of one offspring being both genotype tt and YY in this cross (use the multiplication rule)? d. What is the probability of an offspring of genotype TTYY? e. What is the probability of an offspring of genotype ttyy? f. What is the probability of an offspring of genotype TtYy?

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5. There is a helpful shortcut for calculating the probability of genotypes resulting from a dihybrid cross (or
any cross considering two or more pairs of alleles) that does not require drawing a very large Punnett
square. This is done by first determining the probabilities of each trait alone (using a monohybrid cross)
and then using the multiplication rule to combine the probabilities of all the genotypes being considered.
Using our TtYy plants above, we would first assign each set of alleles to its own Punnett square as
follows:
I t
Y
y
T
TT
Tt
Y YY
Yy
t
Tt
tt
y Yy
УУ
a. Based on the Punnett squares above, what is the probability of being genotype tt in this cross?
b. Based on the Punnett squares above, what is the probability of being genotype YY in this cross?
c. Using the probabilities that you just calculated for the genotypes tt and YY, what is the probability
of one offspring being both genotype tt and YY in this cross (use the multiplication rule)?
d. What is the probability of an offspring of genotype TTYy?
e. What is the probability of an offspring of genotype ttyy?
f. What is the probability of an offspring of genotype TtYy?
ト
Transcribed Image Text:5. There is a helpful shortcut for calculating the probability of genotypes resulting from a dihybrid cross (or any cross considering two or more pairs of alleles) that does not require drawing a very large Punnett square. This is done by first determining the probabilities of each trait alone (using a monohybrid cross) and then using the multiplication rule to combine the probabilities of all the genotypes being considered. Using our TtYy plants above, we would first assign each set of alleles to its own Punnett square as follows: I t Y y T TT Tt Y YY Yy t Tt tt y Yy УУ a. Based on the Punnett squares above, what is the probability of being genotype tt in this cross? b. Based on the Punnett squares above, what is the probability of being genotype YY in this cross? c. Using the probabilities that you just calculated for the genotypes tt and YY, what is the probability of one offspring being both genotype tt and YY in this cross (use the multiplication rule)? d. What is the probability of an offspring of genotype TTYy? e. What is the probability of an offspring of genotype ttyy? f. What is the probability of an offspring of genotype TtYy? ト
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