Suppose you have a diploid organism in which all the chromosomes contributed by

Question

Suppose you have a diploid organism in which all the chromosomes contributed by the sperm have cytological markers on their centromeres that allow you to distinguish them visually from the chromosomes contributed by the egg. Would you expect all the somatic cells (cells other than gametes) to have equal numbers of maternal and paternal centromeres in this organism? No. After fusion of gametes sperm nuclei may be reduced. All somatic cells arise from the zygote by mitosis, and all of them contain only mother centromeres. No. After resolution of synaptonemal complex chromosomes are segregated and random shared between daughter cells during meiosis. Yes. Each centromere is duplicated and one of each is passed to each of the daughter cells resulting from meiosis. Yes. Each centromere is duplicated and one of each is passed to each of the daughter cells resulting from mitosis. Would you expect equal numbers of maternal and paternal centromeres in each gamete produced by that individual? No. Centromeres separate at the mitosis, and independent assortment will randomize the segregation of maternal and paternal centromeres. Yes. Centromeres separate at the mitosis, and equal numbers of maternal and paternal centromeres are passed to each gamete. No. Centromeres separate at the first meiotic division, and independent assortment will randomize the segregation of maternal and paternal centromeres. Yes. Centromeres separate at the first meiotic division, and equal numbers of maternal and paternal centromeres are passed to each gamete.

Explanation / Answer

Part A:The correct answer is:Yes.Each centromere is duplicated and one of each is passed to each of the daughter cells resulting from mitosis.

Reason: Each somatic cell is formed from zygote that contains 2n chromosomes(half from mother and half from father).During mitosis i.e somatic cell division,each daughter somatic cell will also contain 2n((half from mother and half from father).

Part B:The correct answer is:No.Centromeres separate at the first meiotic division and independent assortment will randomize the segragation of maternal and paternal centromeres.

Reason:Independent assortment at first meiotic division is the main reason.

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