Exam: Biology 1081 Spring 2018 Midterm5 Name Please indicate your answer on the

Question

Exam: Biology 1081 Spring 2018 Midterm5 Name Please indicate your answer on the Skantron. Each question 2pts. 1) Homologous chromosomes move toward opposite poles of a dividing cell during 1) A) meiosis I B) fertilization C) mitosis D) meiosis II E) binary fission. 2) Meiosis Il is similar to mitosis in that 2) A) homologous chromosomes synapse B) the daughter cells are diploid. C) the chromosome number is reduced E) DNA replicates before the division 3) If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of 3) the same cell at metaphase of melosis I would be C) 4x A) X B) 0.5x D) 0.25x E) 2x 4) How many different combinations of chromosomes can be packaged in gametes made by an 4) organism with a diploid number of 10(2N-10? A) 16 B) 2 D) 8 E) 32 5) If a horticulturist breeding gardenias succeeds in having a single plant with a particularly 5) desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants? A) Force the plant to self-pollinate to obtain an identical one. B) Add nitrogen to the soil of the offspring of this plant so the desired traits continue C) Backtrack through her previous experiments to obtain another plant with the same traits D) Clone the plant asexually to produce an identical one. E) Breed this plant with another plant with much weaker traits 6) The human X and Y chromosomes A) are almost entirely homologous, despite their different names. B) are both present in every somatic cell of males and females alike. C) include genes that determine an individual's sex. D) include only genes that govern sex determination E) are of approximately equal size and number of genes 7) A given organism has 46 chromosomes in its karyotype. We can therefore conclude which of the 7) following? A) It must be human. B) It must be a primate. C) It must be sexually reproducing D) Its gametes must have 23 chromosomes. E) It must be an animal.

Explanation / Answer

Answer 1. Meiosis 1 . Meiosis 1 is a reduction division in which homologous chromosomes are separated during Anaphase to reduce the chromosome number.

Answer 2- in the mitosis and meiosis 2 the chromatids separate and the number of Chromosome remain same.

Answer 3- 2x. As in S phase DNA content double and it decrease in Anaphase next to Metaphase.

Answer 4- 16. In this case 5 chromosome present in per gametes. So if we fix the one chromosome the other 4 chromosome can change .

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