______ is the failure of chromosomes to separate during meiosis.
failure of homologous pairs of chromosomes to separate during the first meiotic division or of the two chromatids of a chromosome to split during anaphase of mitosis or the second meiotic division. The result is an abnormal number of chromosomes in the daughter cells. Compare disjunction. See also monosomy, trisomy. In meiosis, the chromosome or chromosomes duplicate (during interphase) and homologous chromosomes exchange genetic information (chromosomal crossover) during the first division, called meiosis I. The daughter cells divide again in meiosis II, splitting up sister chromatids to form haploid gametes. Question: Nondisjunction if failure of homologous chromosome... Nondisjunction if failure of homologous chromosomes to separate during Meiosis I or the failure of sister chromatids to separate during meiosis. As a result both homologous chromosomes of both chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosome. Get free help! 1  80% of questions are answered in under 10 minutes. 2  Answers come with explanations, so that you can learn. 3  Answer quality is ensured by our experts. Report Abuse. NONDISJUNCTION. Nondisjunction is the failure of chromosome pairs to separate properly during cell division. This could arise from a failure of homologous chromosomes to separate in meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. The result of this error is a cell with an imbalance of chromosomes. Chapter 11 Sexual Reproduction and Meiosis 53. Nondisjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. Meiosis I separates homologous chromosomes, each still made up of two sister chromatids, into two daughter cells, thus reducing the chromosome number by half. During meiosis II, sister chromatids decouple and the resultant daughter chromosomes are segregated into four daughter cells. 4 chromosomes with 8 DNA molecules. Nondisjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. Chapter 08 - Cell Division and Reproduction 44. An organism that has more or less than the normal number of chromosomes is called: A. Haploid B. Genoploid C. Aneuploid D. Phenoploid E. Karyoploid Aneuploid pertains to having an abnormal number of chromosomes. Bloom's Level: 1. Remember Learning Outcome: 08.13.01 Relate polyploidy to oversized flowers and fruits and aneuploidy to nondisjunction. Section: 08.13 Topic: Genetics 45. A geneticist is studying the failure of chromosomes to separate properly during meiosis.
Nondisjunction