Alterations in gene number may occur in various ways. Which of the folowing best describes a situation where gene number may be altered? Multiple Choice Crossing over during prophase is followed by metaphase and then homologous chromosome segregation during anaphase I. Metaphase Il is followed by sister chromatid segregation at anaphase Il without nondisjunction. Chromosomes undergo nondisjunction during either anaphase I or anaphase II. Because the mammalian X and Y chromosomes are non-homologous there is no crossing over between this pair.

Alterations in gene number may occur in various ways. Which of the folowing best describes a situation where gene number may be altered? Multiple Choice Crossing over during prophase is followed by metaphase and then homologous chromosome segregation during anaphase I. Metaphase Il is followed by sister chromatid segregation at anaphase Il without nondisjunction. Chromosomes undergo nondisjunction during either anaphase I or anaphase II. Because the mammalian X and Y chromosomes are non-homologous there is no crossing over between this pair.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations

Section: Chapter Questions

Problem 22QP: Identify the type of chromosomal aberration described in each of the following cases: a. loss of a...

See similar textbooks

Similar questions

A somatic cell has the genotype DdEe. All chromosomes in this organism are metacentric. Show metaphase and the results of mitosis if the D and E locus are linked on the same chromosome in trans configuration. A sexually reproducing organism has the following phenotype DdEeAaTt: The D and E loci are on the same arm of a metacentric chromosome in cis configuration. The A locus is on the long arm of an acrocentric chromosome and the T locus is on a telocentric chromosome. 2.1. What is the haploid number of this organism? 2.2. Using diagrams show a ceii at metaphase of mitosis and show the results of mitosis.
All of the following are distinctions between the process of mitosis and meiosis EXCEPT: Group of answer choices homologous chromosomes in meiotic cells conduct synapsis meiotic cells produce genetically distinctive cells meiotic cells go through two cell divisions meiotic cells have homologous chromosomes where mitotic cells do not 2. All of these mechanisms ensures that DNA replication is accurate EXCEPT: Group of answer choices DNA splicing by spliceosomes excision repair mismatch repair complementary base pairing
Chromosome structural errors can occur during Meiosis which can lead to health disorders. Examine the figure below and select the correct order of error type from left to right in which they appear. duplicati on, translocation, deleti on, inversion duplication, inversion, del etion, translocation O deletion, translocati on, inversion, duplication O translocation, inversion, duplication, deletion inversion, translocation, duplication, deletion
crossing over within a pericentric inversion produces chromosomes that have extra copies of some genes and no copies of other genes. The fertilization of gametes containing chromosomes with duplications or deletions often result in children with syndromes characterized by developmental delay, intellectual disability, abnormal development of organ systems, and early death. Maarit Jaarola and colleagues examined individual sperm cells of a male who was heterozygous for a pericentric inversion on chromosome 8 and determined that crossing over took place within the pericentric inversion in 26% of the meiotic divisions (M. Jaarola, R. H. Martin, and T. Ashley. 1998. American Journal of Human Genetics 63:218–224). Assume that you are a genetic counselor and that a couple seeks counseling from you. Both the man and the woman are phenotypically normal, but the woman is heterozygous for a pericentric inversion on chromosome 8. The man is karyotypically normal. What is the probability that this…
Characterize the following human chromosomes as to size and as to position of its centromere. Size Type as to position of its centromere Chromosome In Group C 18 in Group G Y Chromosome
What structures are found in a chromosome? Group of answer choices Two structures for the mitotic spindle to bind, and two complex repetitive structures that are maintained by telomerase One structure for the mitotic spindle to bind, and two complex repetitive structures that are maintained by telomerase One structure for the mitotic spindle to bind, and one complex repetitive structure that is maintained by telomerase Two structures for the mitotic spindle to bind, and one complex repetitive structure that is maintained by telomerase.
The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at metaphase I. Chromosome segregation in anaphase I is consistent with which statement? The position where crossing over occurs is random. The sperm that fertilizes the egg is selected at random. The number of crossing over events. is random. Either partner of a homologous pair of chromosomes may end up at either spindle pole.
A line of mouse cells is grown for many generations in a medium with 15N. Cells in G1 are then switched to a new medium that contains 14N. Draw a pair of homologous chromosomes from these cells at the following stages, showing the two strands of DNA molecules found in the chromosomes. Use different colors to represent strands with 14N and 15N. Q. Cells in anaphase II of meiosis, after switching to medium with 14N
● ● Illustrate the chromosome changes in interphase and mitosis using a diploid cell that is 2n=4 (two large and two small chromosomes). Label the circles as G1 and G2 stages of interphase and each phase of mitosis (in order). Draw the chromosome in each circle using the following guidelines. 1) For unreplicated chromosome draw a line (/) and for replicated chromosome draw an X. 2) For simplicity, do not indicate that the chromosomes are decondensed chromatin during interphase. 3) Skip drawing the nuclear membrane or spindle fibers, since we are focusing on the chromosomes. Label genes in the resulting daughter cells as A/a and B/b. (These letters represent genes which are at particular places along the DNA molecule. Each chromosomes can have a thousand genes but we are focusing on these two.) Ask me Qs in class if anythign on this is not clear.
Mitotic nondisjunction can occur, particularly in tumor cells. Assume a single nondisjunction event involving the X chromosome occurs in a cell undergoing mitosis in a human female. First, consider the daughter cell with the smaller number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have? Next, consider the daughter cell with the larger number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have?
Identify the type of chromosomal aberration described in each of the following cases and provide and example. loss of a chromosome segment extra copies of a chromosome segment reversal in the order of a chromosome segment movement of a chromosome segment to another, non homologous chromosome
A line of mouse cells is grown for many generations in a medium with 15N. Cells in G1 are then switched to a new medium that contains 14N. Draw a pair of homologous chromosomes from these cells at the following stages, showing the two strands of DNA molecules found in the chromosomes. Use different colors to represent strands with 14N and 15N. Q. Cells in metaphase I of meiosis, after switching to medium with 14N