78. In the fruit fly Drosophila melanogaster, the white-eye allele is X-linked and recessive. What would be the outcome of a cross between a white-eyed female and a red-eyed male? A. The result would depend on the genotype of the parents. B. All females will be red-eyed and all males will be white-eyed. C. All males will be white-eyed and females will have a 1:1 red-eye to white- eye distribution. D. Any combination of sex and eye colour is possible. E. Female to male distributions and red-eye to white-eye distributions will be 1:1, independent of one another. 79. Of which of the following phenomena do Darwin‟s observations of the Galapagos finches provide a classic example?
20 80. The main advantage of sexual reproduction compared with asexual reproduction is that it enables: 81. Consider three independently-assorting genes in humans: A, B and C. What is the probability that a mother of genotype AaBBCc and a father of genotype AAbbCc will produce a child of genotype AABbcc? 82. Which of the following statements about sexual reproduction is correct? A. Spores are produced by the fusion of two haploid gametes. B. Progeny are genetically identical to their parents. C. Diploid gametes are produced by mitosis. D. Fertilisation results in the formation of a diploid zygote. E. Both male and female gametes are diploid. 83. Which of the following combinations of statements about an autosomal dominant gene is correct? 1.It will exhibit a phenotype in heterozygotes 2.It will be transmitted to all progeny from a homozygous parent 3.It cannot be carried on the Y chromosome 4.It cannot be transmitted from males to males 84. When dihybrid plants of Capsella(Shepherd‟s purse) were inter-pollinated, 94% of the progeny possessed triangular seed capsules and 6% ovoid seed capsules. What is the genotype of a plant with ovoid seed capsules?
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