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Author Question: What is the result of homologous chromosomes failing to separate during meiosis? a. ... (Read 90 times)

sc00by25

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on: Jun 25, 2018
What is the result of homologous chromosomes failing to separate during meiosis?
 
  a. Neurofibromatosis
  b. Nondisjunction
  c. Polyploidy
  d. Conjoined twins

Question 2

The condition in which an extra portion of a chromosome is present in each cell is called:
 
  a. reciprocal translocation.
  b. partial trisomy.
  c. inversion.
  d. Down syndrome.


amy.lauersdorf90

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Nondisjunction is an error in which homologous chromosomes or sister chromatids fail to sepa-rate normally during meiosis or mitosis. Neurofibromatosis is not due to chromosome failure dur-ing meiosis. Polyploidy occurs when a euploid cell has more than the diploid number of chromo-somes. Conjoined twins are not due to chromosome failure during meiosis.

Answer to Question 2

ANS: B
Partial trisomy is a condition in which only an extra portion of a chromosome is present in each cell. A reciprocal translocation occurs when breaks take place in two different chromosomes and the material is exchanged. An inversion occurs when two breaks take place on a chromosome, followed by the reinsertion of the missing fragment at its original site, but in inverted order. Down syndrome is an aneuploidy of the twenty-first chromosome.


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Meiosis Accounts for Independent Assortment of Alleles Meiosis Accounts for Independent Assortment of Alleles
Chromosomes as captured via electron micrograph Chromosomes as captured via electron micrograph
Segregation of two genetic markers, lying on separate chromosomes (top) or on the same chromosome Segregation of two genetic markers, lying on separate chromosomes (top) or on the same chromosome
The stages of meiosis The stages of meiosis
Human chromosomes as seen at metaphase of mitosis in the scanning electron microscope. The replicate Human chromosomes as seen at metaphase of mitosis in the scanning electron microscope. The replicate
Homolog separation in meiosis I Homolog separation in meiosis I
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