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4. In analyzing genetic crosses, it is often necessary to examine more than one trait that is inherited in offspring. Mendel derived his Law of independent assortment of alleles by examining two traits at once. You can follow in Mendel's footsteps by working through a slightly more complex cross-a dihybrid cross-in which you can determine the probabilities of how two different traits can manifest in the offspring. Consider the two traits in pea plants that were discussed above-height (T, t) and pea color (Y, y). A dihybrid cross to trace transmission of these alleles into offspring would involve two hybrid parents, which means both of their genotypes would be TtYy. Imagine that you cross these two parents together-what types of offspring could you possibly get? a. What combination of alleles T, t, Y and y would be found in the gametes of a TtYy parent? b. Using the Punnett square below, distribute the maternal gametes onto the vertical axis and the paternal gametes onto the horizontal axis. Fill in the squares with the appropriate genotypes of offspring that would be formed from each union of maternal and paternal gametes. C. How many genotypically different offspring are possible from this cross? d. What is the ratio of phenotypes in the offspring of this cross? e. What is the probability of producing an offspring with the genotype TtYy from this cross? f. What is the probability of producing an offspring with the genotype ttYy from this cross?

4. In analyzing genetic crosses, it is often necessary to examine more than one trait that is inherited in offspring. Mendel derived his Law of independent assortment of alleles by examining two traits at once. You can follow in Mendel's footsteps by working through a slightly more complex cross-a dihybrid cross-in which you can determine the probabilities of how two different traits can manifest in the offspring. Consider the two traits in pea plants that were discussed above-height (T, t) and pea color (Y, y). A dihybrid cross to trace transmission of these alleles into offspring would involve two hybrid parents, which means both of their genotypes would be TtYy. Imagine that you cross these two parents together-what types of offspring could you possibly get? a. What combination of alleles T, t, Y and y would be found in the gametes of a TtYy parent? b. Using the Punnett square below, distribute the maternal gametes onto the vertical axis and the paternal gametes onto the horizontal axis. Fill in the squares with the appropriate genotypes of offspring that would be formed from each union of maternal and paternal gametes. C. How many genotypically different offspring are possible from this cross? d. What is the ratio of phenotypes in the offspring of this cross? e. What is the probability of producing an offspring with the genotype TtYy from this cross? f. What is the probability of producing an offspring with the genotype ttYy from this cross?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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4. In analyzing genetic crosses, it is often necessary to examine more than one trait that is inherited in offspring. Mendel derived his Law of independent assortment of alleles by examining two traits at once. You can follow in Mendel's footsteps by working through a slightly more complex cross-a dihybrid cross-in which you can determine the probabilities of how two different traits can manifest in the offspring. Consider the two traits in pea plants that were discussed above-height (T, t) and pea color (Y, y). A dihybrid cross to trace transmission of these alleles into offspring would involve two hybrid parents, which means both of their genotypes would be TtYy. Imagine that you cross these two parents together-what types of offspring could you possibly get? a. What combination of alleles T, t, Y and y would be found in the gametes of a TtYy parent? b. Using the Punnett square below, distribute the maternal gametes onto the vertical axis and the paternal gametes onto the horizontal axis. Fill in the squares with the appropriate genotypes of offspring that would be formed from each union of maternal and paternal gametes. c. How many genotypically different offspring are possible from this cross? d. What is the ratio of phenotypes in the offspring of this cross? e. What is the probability of producing an offspring with the genotype TtYy from this cross? f. What is the probability of producing an offspring with the genotype ttYy from this cross?
Transcribed Image Text:4. In analyzing genetic crosses, it is often necessary to examine more than one trait that is inherited in offspring. Mendel derived his Law of independent assortment of alleles by examining two traits at once. You can follow in Mendel's footsteps by working through a slightly more complex cross-a dihybrid cross-in which you can determine the probabilities of how two different traits can manifest in the offspring. Consider the two traits in pea plants that were discussed above-height (T, t) and pea color (Y, y). A dihybrid cross to trace transmission of these alleles into offspring would involve two hybrid parents, which means both of their genotypes would be TtYy. Imagine that you cross these two parents together-what types of offspring could you possibly get? a. What combination of alleles T, t, Y and y would be found in the gametes of a TtYy parent? b. Using the Punnett square below, distribute the maternal gametes onto the vertical axis and the paternal gametes onto the horizontal axis. Fill in the squares with the appropriate genotypes of offspring that would be formed from each union of maternal and paternal gametes. c. How many genotypically different offspring are possible from this cross? d. What is the ratio of phenotypes in the offspring of this cross? e. What is the probability of producing an offspring with the genotype TtYy from this cross? f. What is the probability of producing an offspring with the genotype ttYy from this cross?
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