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By David P Clark; Nanette J Pazdernik

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In haploid a cells the locus genes are MATa1 and MATa2. In a cells the locus genes are MATa1 and MATa2. During meiosis, the genes at this locus are exchanged by recombination so that half the spores have MATa1 and MATa2 and the other half, MATa1 and MATa2. The gene products control expression of the mating pheromone and receptors in the haploid cells. o Rep D Just as meiosis creates haploid male and female gametes in humans, meiosis in yeast creates haploid cells of two different mating types. Because they are structurally the same, rather than calling them male and female, the yeast mating types are a and a.

2. What is the difference between DNA and RNA? a. DNA contains a phosphate group, but RNA does not. b. Both DNA and RNA contain a sugar, but only DNA has a pentose. c. The sugar ring in RNA has an extra hydroxyl group that is missing in the pentose of DNA. d. DNA consists of five different nitrogenous bases, but RNA only contains four different bases. e. RNA only contains pyrimidines and DNA only contains purines. 3. Which of the following statements about eukaryotic DNA packaging is true? a. The process involves DNA gyrase and topoisomerase I.

Basics of Biotechnology drosophila melanogaster, the Common fruit fly sis ho p or m eta M Drosophila adult female Egg Pupa First instar larva Third instar larva Another multicellular model organism widely used because of its genetics is Drosophila melanogaster, usually referred to simply as Drosophila, the common fruit fly. This insect is about 3 mm in length and can often be found around rotting fruit. These flies are easy to grow and maintain in a lab. They need a food source and are kept in a bottle capped with cotton so they cannot escape.

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