Within hours after conception, the first 23 pairs of chromosomes within the zygote _____, forming two complete sets of genes. Question 6 options: atrophy duplicate differentiate detach
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Step 1: After conception, the zygote contains one set of 23 chromosomes from the sperm and one set of 23 chromosomes from the egg, making a total of 46 chromosomes arranged in 23 pairs. Show more…
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chromosomes in the parent cell ____ before they divide into daughter cells through mitosos a. split in half b. double c. triple d. quadruple
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Why are two children born to the same parents (not identical twins) unlikely to have the same genetic makeup? A) Crossing-over recombines portions of sister chromatids. B) Fertilization provides a new pairing of chromosomes. C) Each sperm or egg has a random assortment of chromosomes, half from each pair. D) Chromosomes align themselves independently during meiosis I. E) All of the answer choices lead to genetic differences among siblings. You are examining a cell under the microscope that is undergoing cell division and cannot find any asters. What else would be absent in this cell? A) a cell plate B) centrosomes C) a spindle D) a cleavage furrow E) chromosomes Meiosis results in a change in chromosome number indicated by A) 2n to 2n. B) 2n to n. C) n to 2n. D) n to n. E) 2n to 2n in diploid organisms, n to n in haploid. Which of the following is a correct association? A) cytokinesis-division of the chromosomes B) centromere-forms spindle fibers during prophase C) haploid-having two copies of each chromosome D) sister chromatids-two identical chromosome strands still attached at the centromere E) mitosis-when a cell duplicates and then divides twice to reduce chromosome number by half In humans, the diploid number of chromosomes is A) 20. B) 46. C) 23. D) variable depending on whether male or female. E) 92. Which of the following best describes the role of histones? A) Histones play a role in coding for hereditary features. B) Histones make RNA synthesis possible. C) Histones are responsible for packaging the DNA so it can fit into a small space. D) Histones are not thought to play any role in the cell. E) Histones determine the diploid number of chromosomes.
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