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Question: Down syndrome is the result of an extra 21st chromosome in humans. In the process of meiosis for the mother, give all possible stages where it could lead to an offspring with Down syndrome, given that both parents are normal. Draw a picture showing the error in one of the […]

The sex of some fishes is determined by the same XY system as inhumans. An allele of one locus on the Y chromosome of the fish Lebistes causes apigmented spot to appear on the dorsal fin. A male fish that has a spotted dorsal fin is mated witha female fish […]

Identify an environmental issue facing your community. Imagine that you have been asked to educate the members of your community on this environmental issue. Create a 12- to 14-slide presentation about your selected environmental issue. Include the following in your presentation: An overview of your selected issue. The effects of human activities on […]

Recessive mutations at three linked loci are studied in fruit flies. For the first locus, forked bristles are produced by the recessive allele f. At the second locus, outstretched wings are produced by the recessive allele o. At the third locus, garnet eyes result from the recessive allele g. Wild […]