Which of the following is false regarding Down Syndrome?O can be caused by a Robertsonian translocation which is the fusion of the q arm of chromosome 21 with the q arm of chromosomeO can be caused by a nondisjunction eventO can be caused by equal exchange of chromatids during crossing overO Down syndrome individuals could possibly have normal children

The thread like structures seen inside the nucleus of every cells are called chromosomes. These are…

Which of the following is false regarding Down Syndrome? O can be caused by a Robertsonian translocation which is the fusion of the q arm of chromosome 21 with the q arm of chromosome can be caused by a nondisjunction event can be caused by equal exchange of chromatids during crossing over Down syndrome individuals could possibly have normal children

Which of the following is false regarding Down Syndrome? O can be caused by a Robertsonian translocation which is the fusion of the q arm of chromosome 21 with the q arm of chromosome can be caused by a nondisjunction event can be caused by equal exchange of chromatids during crossing over Down syndrome individuals could possibly have normal children

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 4SQ

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Match the chromosome terms appropriately. ___ polyploid a. symptoms of a genetic disorder ___ deletion b. chromosomal mashup ___ aneuploidy c. extra sets of chromosomes ___ translocation d. gets around ___ syndrome e. a chromosome segment lost ___ transposable element f. one extra chromosome ___ X-linked g. allele on the X chromosome
Abnormalities in the number of X chromosomes tend to be milder than the same abnormalities in autosomes because of _______. a. deletions b. nonbomologous recombinat ion c. synapsis d. X inactivation
A phenotypically normal individual has the following combinations of normal and abnormal chromosomes:The normal chromosomes are shown on the left in each pair.Suggest a series of events (breaks, translocations, crossovers, etc.)that may have produced this combination of chromosomes.
Which of the following statement(s) regarding homologous chromosomes is (are) true? CHOOSE ALL THAT APPLY Homolgues contain the same genes but their order on the chromosome differs In each tetraploid cell, there are two homologous chromosomes Homologous pairs exist in haploid cells. Homolgues contain the same genes but might contain different alleles Homologues become physically connected (pair up) during prophase I
In mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis. Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes. Males with an extra Y chromosome (XYY) occasionally are found due to inappropriate segregation of the chromosomes (i.e. non-disjunction). Which of the following could give rise to such an XYY male? Answer Yes or No for each situation. nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father nondisjunction in the second meiotic division of oogenesis; normal meiosis in the father
Which of the following chromosomal events can result in Down’s Syndrome offspring? a) Primary nondisjunction of chromosome 21 b) Secondary nondisjunction of chromosome 21 c) A parent with a Robertsonian Translocation of 21 to 14 d) All of the above
The following characteristics are associated with all variations in chromosomal structure EXCEPT ____. A. Breakages result in the production of sticky ends B. They begin with a chromosomal break C. They can result in genomic instability D. Broken ends are prone to degradation E. They cause heritable defects when induced during mitosis in somatic cells
In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly interferes with normal eye development. Eyes are either very small or absent. The ey gene is found on chromosome 4, which is the smallest of the four chromosomes in the organism. Individuals with a single copy or three copies of chromosome 4 are viable and can reproduce. A trisomic wild-type male is crossed with a disomic wild-type female: see attached image Determine the chromosome constitution and phenotypic ratios in the offspring. Assume random segregation of chromosomes into gametes.
During crossing over,a. chromatids of homologous chromosomes exchange parts.b. mutations occur with higher than average frequency.c. chromatids of nonhomologous chromosomes exchange parts.d. nondisjunction occurs.
During a practical, a group of biology students are tasked to study the cell cycle of an insect. This insect has the karyotype 2n=6, with genotype Aa Bb Ee HH. The students must draw a G2 cell about to enter meiosis, using red lines for maternal chromosomes, blue lines for paternal chromosomes and black dots to represent centromeres. The drawing provided by the students is shown below. a) Identify three mistakes the students made when producing this diagram. In your answer only refer to elements already present in the figure. (3) b) This fly is used in a testcross. What is the probability of producing a fly with genotype Aa bb ee Hh?
The plant Haplopappus gracilis has a 2n of 4. A diploid cellculture was established and, at premitotic S phase, aradioactive nucleotide was added and was incorporatedinto newly synthesized DNA. The cells were then removed from the radioactivity, washed, and allowed to proceed through mitosis. Radioactive chromosomes or chromatids can be detected by placing photographic emulsionon the cells; radioactive chromosomes or chromatids appeared covered with spots of silver from the emulsion.(The chromosomes “take their own photograph.”) Drawthe chromosomes at prophase and telophase of the firstand second mitotic divisions after the radioactive treatment. If they are radioactive, show it in your diagram. Ifthere are several possibilities, show them, too.
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. There are no other chromosomes. Using diagrams, show a cell at metaphase of mitosis and show the results of mitosis. Ensure you show the location of the gene loci on the different chromosomes.