Attempt this weeks four (4) #MCAT questions to win a free month of - TopicsExpress

Attempt this weeks four (4) #MCAT questions to win a free month of Firecracker! Answers MUST include your reasoning and be submitted before we reveal correct answers the following mornings. Passage: Lamarck: Theory of heritable characteristics - The theory of heritable characteristics posits that traits that are acquired over an organism’s life are passed on to its offspring. In this theory, organs that are used grow stronger over generations, while organs that are not used shrivel up and eventually disappear. Further, Lamarck theorized that organisms originated as simplistic beings and over generations grew towards greater complexity. In this model, humans are considered the perfect beings. Mendelian genetics - Gregor Mendel identified the basis for genetic inheritance almost 150 years ago. Mendel cross-bred pea plants for generations and observed the patterns of inheritance. Mendel focused on several bimodal traits, as in traits that have two phenotypic possibilities, including seed color and shape. He found that when pea plants with different traits are bred with each other, rather than the traits blending, one trait prevails. Further, he found that traits not present in an individual can be passed on to successive generations. From this, Mendel made several conclusions: 1. Genetic units are passed unchanged to successive generations. 2. Progeny inherit one copy of a unit from each parent. 3. A trait can be passed to progeny without appearing in either parental line. 4. Different units are passed on independently of each other. Question 3: Which of the following statements contradicts Lamark’s hypothesis that organisms evolve toward greater complexity? A) Scientists have discovered that early humans and Neanderthals likely mated, as genes from Neanderthals have been found in humans today. B) Wing structures have evolved at least three separate times in history in bats, birds, and insects. C) There are many examples of evolutionary reversions found in nature. This reversion is a loss of traits that causes a resemblance to the ancestral form. D) Recently, a family has been discovered that walks with all four limbs instead of just their legs. This was found to be due to reduced growth of the cerebellum. firecracker.me

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