Question
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14) genetically identical 2n gamete cells 5) Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have times more DNA than G 1 phase cells. The cells of this group are A) between the GI and S phases in the cell cycle B) in the G2 phase of the cell cycle C) in the M phase of the cell cycle D) in the S phase of the cell cycle 15) The first gap in the cell cycle (G|) corresponds to A) normal growth and cell function B) the phase in which DNA is being replicated C) the beginning of mitosis D) the phase between DNA replication and the M phase 16) In human and many other eukaryotic species' cells, the nuclear membrane has to disappear to permit A) cytokinesis B) the attachment of microtubules to kinetochores C) the splitting of the centrosomes D) the disassembly of the nucleolus 17) Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA? A) G1 B) S C) G2 D) M 18) What do we mean when we use the terms monohybrid cross and dihybrid cross? A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B) A dihybrid cross involves organisms that are heterozygous for two characters that are being tudied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied. C) A monohyb for two generations. D) A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio. rid cross is performed for one generation, whereas a dihybrid cross is performed ost significant conclusion that Gregor Mendel drew from his experiments 19) What was the m with pea plants? A) There is considerable genetic variation in garden peas B) Traits are inherited in discrete units and are not the results of "blending." C) Recessive genes occur more frequently in the Fi generation than do dominant ones. D) Genes are composed of DNA
Explanation / Answer
5- D in the S phase of cell cycle because in S phase DNA replication is occuring.
15- A - normal growth and cell function
16- B- attachment of microtubules to kimetochore
17- C G2
18- B
19- B
