11. Let's say, instead of being on different chromosomes, the T and F gene were right on top of each other on the same chromosome, that is the two genes where perfectly linked. This is a phenomenon called linkage. What would the expected phenotypic ratio of the F2 progeny be if the T gene and the F gene were perfectly linked?

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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11. Let's say, instead of being on different chromosomes, the T and F gene were right on top
of each other on the same chromosome, that is the two genes where perfectly linked.
This is a phenomenon called linkage. What would the expected phenotypic ratio of the
F2 progeny be if the T gene and the F gene were perfectly linked?
Transcribed Image Text:11. Let's say, instead of being on different chromosomes, the T and F gene were right on top of each other on the same chromosome, that is the two genes where perfectly linked. This is a phenomenon called linkage. What would the expected phenotypic ratio of the F2 progeny be if the T gene and the F gene were perfectly linked?
Activity E: Predicting the outcome of a dihybrid cross
The resulting phenotypic ratios in the F₂ generation of a dihybrid cross (2 traits) can be quite
different than those observed from a monohybrid cross, but the process is essentially the same.
First, you list all possible gametes each parent and subsequent parents can produce. Second,
you then assign the gametes to a Punnett square and fill it in. Finally, you count the progeny and
determine the number of progeny in each phenotypic category.
Remember, when determining the types of gametes possible, each gamete must have one
member of each homologous pair of chromosomes. This means there needs to be one copy of
every gene. For example, if you are considering a T gene (ability to taste PTC) and an F gene
(let's say earwax texture- wet earwax is dominant and dry earwax is recessive), each gamete
must have one allele for the T gene (either T or t) and one allele for the F gene (either For f).
Transcribed Image Text:Activity E: Predicting the outcome of a dihybrid cross The resulting phenotypic ratios in the F₂ generation of a dihybrid cross (2 traits) can be quite different than those observed from a monohybrid cross, but the process is essentially the same. First, you list all possible gametes each parent and subsequent parents can produce. Second, you then assign the gametes to a Punnett square and fill it in. Finally, you count the progeny and determine the number of progeny in each phenotypic category. Remember, when determining the types of gametes possible, each gamete must have one member of each homologous pair of chromosomes. This means there needs to be one copy of every gene. For example, if you are considering a T gene (ability to taste PTC) and an F gene (let's say earwax texture- wet earwax is dominant and dry earwax is recessive), each gamete must have one allele for the T gene (either T or t) and one allele for the F gene (either For f).
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