HW1 key - Biology 202 NAME: Fall 2007 T.A.: Homework 1...

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Biology 202 NAME: Fall 2007 T.A.: Homework 1 Discussion Section #: Due: August 30 or 31 in discussion 1 (2 pts). Ferns have both a haploid- and a diploid-dominant stage in their life cycle. Early in the life cycle, all the cells in the prothallus (the young fern plant) are haploid. The prothallus is the gamete-producing stage of the life cycle. a. What type of nuclear division must be involved in the production of gametes by the prothallus? Mitosis - the cells are already haploid The union of two fern gametes produces a diploid gamete, which grows (by mitosis) into the more commonly recognized diploid fern plant. This plant in turn produces haploid spores to develop into the prothallus. b. What type of nuclear division must be involved in the production of spores by the diploid plant? Meiosis – the chromosome number must be reduced by 1/2 2 (2 pts). The diploid chromosome number in humans is 46 (23 pairs), and one member of each chromosome pair is present in each gamete. a. Assuming no crossovers occur, what is the probability that a gamete will contain
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HW1 key - Biology 202 NAME: Fall 2007 T.A.: Homework 1...

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