CELL DIVISION
MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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omesthe deletion of DNA during translation
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mutations occuring during the blastula stage
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DNA exposed to radiation after the birth of the organism
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failure of homologous chromosomes to separate during meiosis.
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Detailed explanation-1: -Nondisjunction means that a pair of homologous chromosomes has failed to separate or segregate at anaphase so that both chromosomes of the pair pass to the same daughter cell. This probably occurs most commonly in meiosis, but it may occur in mitosis to produce a mosaic individual.
Detailed explanation-2: -If homologous chromosomes fail to separate during meiosis I, the result is two gametes that lack that particular chromosome and two gametes with two copies of the chromosome.
Detailed explanation-3: -When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss or health problems in a child.
Detailed explanation-4: -When sister chromatids or homologous chromosomes are unable or fail to separate during meiosis (meiosis I or meiosis II), nondisjunction results. Nondisjunction is the inability of chromosome pairs to separate during the process of meiosis.
Detailed explanation-5: -Which of the following would MOST likely result in an abnormal chromosome number? Failure of homologous chromosomes to separate during meiosis.