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Dihybrid and Two-Trait Crosses
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What is the probability that their children will have hemophilia? Students will practice identifying sex-linked traits using these characters as the back story, so they get really excited about the lesson. Once we have gone over the presentation, I ask the students to make a list of key ideas they took from the presentation and write them on post it notes that they can add to the concept map they created in The Tour the Basics lesson. Show the cross of a red eyed female heterozygous and a red eyed male. How could a female become colorblind if the mother was heterozygous? Show the cross of a female black cat, with a male orange cat. The instructions for forming species' characteristics are carried in DNA. Show the cross. A woman who has hemophilia marries a normal man. What are the genotypes of these flies: Inheritance of Traits — Each chromosome consists of a single very long DNA molecule, and each gene on the chromosome is a particular segment of that DNA. What percentage of the kittens will be calico and male? What is the probability of having a hemophiliac female offspring? How many of their children will have hemophilia, and what is their sex? Baldness is a sex-linked trait. In fruit flies, eye color is a sex linked trait.
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