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Early in development, most human cells turn off expression of an essential component of telomerase, the enzyme responsible for addition of telomere repeat sequences (5′ TTAGGG 3′) to the ends of chromosomes. Thus, as our cells proliferate, their telomeres get shorter and shorter, but are normally lost over the course […]

Natural selection is the key mechanism of evolution and accounts for the commonality and diversity in nature. Can you give a specific example of a successful species and unsuccessful species adapting and not adapting respectively to their environments and why their adaptations or lack of made it so? How can […]

You performed breeding experiments on a newly discovered species of unicorn. the horns came in three colors: white, black and gray. A single gene controls color. When you crossed pure-breeding white-horned individuals with a pure-breeding black-horned ones, you got all gray-horned F1 offspring. You then crossed the gray-horned offspring with […]

1. What field of biology studies the classification of living organisms? 2. What is binomial nomenclature and what are its basic rules? 3. What are the categories for the classification of living organisms? 4. What are the five kingdoms into which living organisms are divided? Which group of living organisms […]