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A series of genetic crosses are planned to determine whether the genes for two characters are linked or unlinked. It is known from previous work that both characters exhibit a complete dominance inheritance pattern. In this particular species of elves, silver colored hair is dominant to tan colored hair, and […]

A man has fragile X syndrome. What is his genome like (regarding his sex chromosomes)? If he has a child with a normal woman, what are the chances of the child’s having fragile X syndrome if it is a boy? If it is a girl? What are the possible pedigree […]

Scientific advances are pointing researchers to new ideas about how to reduce the side effects of epilepsy medications and improve therapy options for those resistant to current medications. Ongoing studies in animals and people are also illuminating the subtle changes that take place in the brain shortly before seizures begin. […]

A plant species X with n=5 chromosomes was crossed with a related species Y with n = 7 chromosomes. The F1 hybrids produced only a few pollen grains, which were used to fertilize the ovules of related species Z with n=7 chromosomes. A few plants were produced from this cross, […]