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QUIZ 4. Biol 1406 Name ___________________________ ________ 1. What happens if a baby has only one X chromosome, and no Y? 4. A plant has a dominant phenotype but an unknown genotype. The proper experiment to determine its correct genotype would be a/an: a. heterozygotic cross. b. testcross. c. homozytic cross. d. F1 cross. e. back cross. a. Such a major chromosome deficiency is lethal, so the baby would be stillborn. b. This baby would be a female with Turner syndrome. c. The baby would be a male with Turner syndrome. d. The individual would have Klinefelter syndrome. 5. The Law of Segregation (Mendel) is best demonstrated using: a. a monohybrid cross. b. a dihybrid cross c. a testcross. d. a back cross. e. two recessive varieties of the gene under study. 2. What are alleles? a. specific physical locations of genes on a chromosome b. variations of the same gene (i.e., similar nucleotide sequences on homologous chromosomes) c. homozygotes d. heterozygotes 3. A single gene capable of influencing multiple phenotypes within a single organism is said to be __________. a. codominant for that gene b. incompletely dominant for that gene c. polygenic for that gene d. pleiotropic for that gene 1