Which non-disjunction event has more chromosome number aberrations? Why?

Q: In meiosis, after telophase I, do other cells (comparing one another) have the same combination of…

A: Cell cycle consists of stages of cell growth and reproduction. In M phase of cell cycle, cell…

Q: If nondisjunction occurs in a chromosome pair, what will be its effect on the gametes and the…

A: Nondisjunction occurs when homologous chromosomes or sister chromatids fail to divide properly…

Q: In what type of chromosome is the centromere is more or less in the middle?

A: A chromosome is a rod-shaped structure that basically contains DNA and protein. A structure…

Q: For a couple, what is the significance of knowing chromosomal aberrations?

A: Chromosomes are thread-like structures present inside the nucleus of the cell. They are made up of…

Q: where is the chromosome abnormality? (chromosomes 1-23)

A: The chromosomal abnormality is the result of errors in the cell division following meiosis or…

Q: If there are 9 chromosome pairs, how many univalents are there at anaphase?

A: The chromosomes are found in eukaryotic cells that is the compact form of DNA. The DNA with histone…

Q: How many chromosome duplications take place in Meiosis?

A: Meiosis: It is the process of cell division forming four daughter cells that contain half of the…

Q: No disjunction is the reason we get chromosome number anomalies. Explain?

A: Chromosomes are present in the nucleus of the cell and are actually a compilation of the cell’s DNA.…

Q: what is the benefit of crossing over?

A: REPRODUCTION:- It is the production of offspring from the parents. It is of two types:- 1)Asexual…

Q: What is the other name given to sex chromosomes? What is the function of sex chromosomes?

A: Introduction - A sex chromosome is a chromosome that is different in shape, size, and behaviour from…

Q: Explain how nondisjunction produces monosomy and trisomy chromosomeconditions.

A: Mitosis: A type of cell division in which parent cell gives rise to 2 identical daughter cells with…

Q: If a diploid a 40 pair of chromosomes, what is the chromosome number by the end telophase?

A: Introduction: Cell cycle is an ordered sequence of events occurring in a cell. Cell cycle results in…

Q: Why is random assortment of chromosomes necessary? What can we expect if this does not occur?

A: When reproductive cells mature, the Principle of Independent Assortment outlines how various genes…

Q: You observe a very large pairing loop at meiosis. Is it more likely to be from a heterozygous…

A: The cell is the fundamental underlying, useful, and natural unit of every known life form. Cells are…

Q: What causes chromosomal rearrangements?

A: Chromosomes carry the genetic material DNA. Gene is a segment of DNA. The necessary information for…

Q: What type of chromosome or fragment cannot be formed by the following chromosome inversion…

A: An inversion is a chromosome rearrangement in which a segment of chromosome is reversed end-to-end.…

Q: Why is random assortment of chromosomes necessary? What can we expect if this does not occur?

A: Gregor Mendel postulated a laws of inheritance ;which are mainly applicable to the eukaryotic…

Q: Why does more crossing over occur between two distantly linkedgenes than between two genes that are…

A: Answer- Crossing over is the mechanism in which a part of the sister chromatids of the homologous…

Q: What is the end result of crossing over?

A: Crossing over allows the exchange of genetic material and forms unique combinations of alleles. This…

Q: How does non-disjunction in meiosis lead to numerical chromosomal aberration?

A: Chromosome is the rod shaped, dark stained bodies which are most prominently seen in the metaphase…

Q: Why does nondisjunction in meiosis I results in a higher proportion of faulty gametes than…

A: Of all the chromosomal disorders, the most readily recognisable from a karyogram are chromosome…

Q: In what phase of meiosis is chromosome recombination most common?

A: Introduction :- Meiosis is a process in which a single cell divides twice to produce four cells with…

Q: Which of the following chromosome pairs would contain all of the same genes (not necessarily at the…

A: A chromosome is a long DNA molecule that comprises part or all of an organism's genetic material.…

Q: What kind of chromosomal mutations is/are produced by unequal crossing over?

A: Mutation refers to both the process of altering a gene or chromosome and the outcome of that…

Q: How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes?

A: Crossing over is a process where two homologous chromosomes exchange their genetic material to…

Q: If an organism has 15 pairs of homologous chromosomes, how many chromosomes will each daughter cell…

A: Mitosis: Some cells in the skin, embryo, gut divide constantly and there are few cells that divide…

Q: Why is the frequency of recombinant gametes always half the frequency of crossing over?

A: Crossing over is the way in which exchange of genes between two chromosomes, lead to non-identical…

Q: Given the diploid chromosome number highlighted above, what is the haploid chromosome number?

A: Cell division is the process of division of cell which occurs by two process - Mitosis Meiosis…

Q: At what stage of meiosis (I or II) does crossing-over occur?

A: Crossing-over is a process that occurs during meiosis (I or II) whereby homologous chromosomes…

Q: What are nonhomologous chromosomes?

A: The chromosome is an organized structure of proteins and DNA (Deoxyribonucleic acid) in a cell. It…

Q: At the end of S phase, each chromosome has replicated to produce two complete copies that are joined…

A: The number of chromatids on chromosomes doubles after replication, however the nuclei stay diploid…

Q: What is the rule of inversion?

A: Genes are the functional unit of heredity. The genes code for proteins which are vital for growth…

Q: Why are changes in chromosome number almost always more severe than changes in chromosome structure?

A: Introduction  Chromosomal aberrations are the common cause of abnormal development of the embryo or…

Q: During meiosis, does random assortment occur before or after crossing-over?

A: Meiosis is the cell division that includes meiosis I and meiosis II without any DNA replication…

Q: How does nondisjunction lead to disorders in chromosome number?

A: When the nucleotides sequences in the genome of an organism are altered or changed due to mistakes…

Q: What is crossover? When does it happen? What are the consequences?

A: The cell cycle is the sequence of events that take place in the cell. The cell cycle has 4 main…

Q: What is the law of the superposition?

A: Answer - The law of superposition is a law of stratigraphy science

Q: How does nondisjunction lead to abnormalities in chromosome number? Describe two types of genetic…

A: The failure of chromosome to seperate properly  during mitosis or meiosis is called nondisjunction…

Q: What type of nondisjunction is the chromosome abnormality? Trisomy Or Monosomy

A: Trisomy: when one chromosome is present in 3 copies then the condition is called trisomy. The total…

Q: What is the cross between the progeny of F1 and the homozygous reccessive parent called? How is it…

A: Introduction  Monohybrid cross deals with one character controlled by one pair of alleles such as…

Q: Why is the Barr body more brightly staining in a cellnucleus than the other chromosomes?

A: Cell is the smallest structural and, functional unit of life. It is simple machinery that houses all…

Q: Why are the homologous regions of the X and Y chromosome important during meiosis?

A: One of the defined types of cell divisions characterized by the occurrence of two rounds of division…

Q: Why do individuals with an excessive number of sex chromosomes often show minimum phenotypes?

A: Introduction :- The X and Y chromosomes are found in humans and most other mammals. Males have both…

Q: How do we know if Nondisjunction occurs in meiosis one or two?

A: Meiosis is a type of cell division which generally occurs in germ cells or reproductive cells.…

Q: Down syndrome involves trisomy ___. (Which chromosome is affected?) 19 5 3 21

A: Aneuploidy is a defective condition in which one or more individual chromosomes are added to or…

Q: what event takes place during meiosis prophase (as opposed to mitosis prophase) that makes it…

A: Cell division is splitting phenomenon which comprises of splitting of parent cell and results in…

Q: What would be the result if a chromosome did not have a kinetochore?

A: Deoxyribonucleic acid or DNA is the hereditary material present in the nucleus of the cell. It…

Q: When is the only time crossing over can occur?

A: The cell cycle is the orderly series of events that allows a cell to grow and divide forming…

Q: What is Nondisjunction? How is it linked to meiosis, mitosis and cancer?

A: Nondisjunction is the failure of homologous chromosomes or sister chromatids to isolate subsequently…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.