Define and give an example of adaptive radiation
What will be an ideal response?
Adaptive radiation is seen in a population over time when different species form in response to different environmental pressures, different habitats, different feeding strategies, etc. The adaptive radiation of marsupials in the Australian region is a good example. The species that are native to that region have filled the niches seen in other areas where placental animals evolved.
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List three hypotheses that explain why selection would favor large brains in early humans. ____
Fill in the blank with the appropriate word.
In muscle function at the sarcomere level, the formation of cross-bridges is regulated by the binding of ___ ions to ____.
A. calcium, troponin B. calcium, tropomyosin C. calcium, myosin D. sodium, troponin E. sodium, tropomyosin
Vertebrate locomotion results from the contraction of muscles anchored to what other tissue?
A. Bone B. An exoskeleton C. Nerves D. Each other E. The plasma membrane
The genes for zeste eyes and forked bristles are located on the X chromosome in Drosophila melanogaster. Both genes are recessive. A cross is made between a zeste-eyed female and a forked-bristled male
(a) If 200 offspring from this cross were obtained, present the expected number, sex, genotype, and phenotype in each class of the F1. (b) If the F1 offspring were crossed to produce 800 flies of an F2 generation, present the expected number, sex, and phenotype in each class. Assume no crossing over.