Two lines of work indicated that crossing over actually involves breakage and reunion of chromatid material. What organisms were involved, and who did the work?
What will be an ideal response?
Creighton and McClintock (corn) and Stern (Drosophila)
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Clara has alkaptonuria. Her symptoms include back spasms, dark urine, arthritis, hearing loss, kidney stones, heart valve damage, and darkened ear tips. This condition is therefore
A) genetically heterogenic. B) pleiotropic. C) dominant. D) epistatic.
. Describe the enzymatic digestion that takes place in each structure of the digestive tract
What will be an ideal response?
Mendel studied tall and short pure-breeding lines of pea plants. Inherited genetic variation would dictate that one line would produce tall plants and the other short plants, but the genes and phenotypes are influenced by what external factor?
What will be an ideal response?
Most of the early hominid fossils have been found in ________, a 2,000 mile fault line.
A. an area between Java and China B. the Neander Valley of Germany C. Royal Gorge, North America D. the East African Rift Valley