If the X and Y chromosomes do not segregate from each other at meiosis I (Anaphase I nondisjunction) the gametes produced will contain: Either XY or no sex chromosome Either XX or XY X, XX, Y, and YY Either X or Y, but never XX or YY None of the above

The cell is the basic structural and functional unit of life. It carries out various functions in the body. It undergoes the process of growth and division throughout its life. To carry out various functions it is necessary that the cell grows and undergoes the division process. There are two types of nuclear division in the eukaryotic diploid cells that are mitosis and meiosis. The chromosomes are the filamentous bodies present in the nucleus. The chromosomes are composed of DNA(deoxyribonucleic acid) combined with histone proteins. They have the ability of self-replication. They play an important role in the heredity, variation, and mutation of species. They are visible only during cell division. The chromosomes which are morphologically and structurally identical are called homologous chromosomes. The presence of a whole set of chromosomes is called euploidy. The diploid organisms have two sets of chromosomes. The chromosomes Exist in Homologous Pairs in diploid organisms.The homologous chromosomes are segregated during anaphase I of the meiosis. The sister chromatids are segregated during anaphase II of the meiosis. During anaphase I the homologous chromosomes are segregated and move towards the opposite pole. The condition in which the chromosomes fail to segregate is called is non-disjunction. If the nondisjunction occurs at anaphase I it will produce two types of cells- One with both the homologous chromosomes and the other with no homologous chromosomes. After the second meiotic division, it will have four types of gametes- two of which will have both the chromosomes and the other two with no chromosomes. If the X and Y chromosomes do not segregate from each other at meiosis I (Anaphase I nondisjunction) the gametes produced will contain either XY or no sex chromosome. Either XY or no sex chromosome-If the X and Y chromosomes do not segregate from each other at meiosis I (Anaphase I nondisjunction) the one cell after the first meiotic division will have both X and Y chromosomes while the other cell will have no chromosome. The gametes formed due to nondisjunction will either have an XY chromosome or no sex chromosome. Either XX or XY- Since the chromosomes are not segregated they will remain together as an XY pair. Hence no gamete will have XX chromosomes. X, XX, Y, and YY- Since the chromosomes are not segregated they will remain together as XY pairs. So the gametes will not have X, XX, Y, and YY chromosomes. Either X or Y, but never XX or YY- Since the chromosomes are not segregated they will remain together as an XY pair. So the gametes will have both the chromosomes together as XY and not a single chromosome as either X and Y. None of the above- The gametes formed due to nondisjunction will either have an XY chromosome or no sex chromosome.