Nondisjunction of chromosome #21 in which of the following (1-7) could result in a fetus/child with trisomy...

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Biology

Nondisjunction of chromosome#21 in which of the following (1-7) could result in a fetus/childwith trisomy 21 (47,XX+21) or (47,XY+21)? To indicate your choices,type an â€œRâ€ at the end of each RIGHT choice, and a â€œWâ€ at the endof each WRONG choice.
I. Anaphase 1 in spermatogenesis
II. Anaphase 2 in spermatogenesis
III. Anaphase 1 in oogenesis
IV. Anaphase 2 in oogenesis
V. The first anaphase of a normalzygote.
VI. The anaphase in one of the 2 cellsproduced from the first normal division of a normal zygote.
VII. The anaphase in one of the 4cells produced from the first normal division of a normalzygote.

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ANSWER According to me nondisjunction is the process during which the homologous chromosomes are not able to separate and thus lead to abnormality in terms of number of chromosomes This process can occur during meiosis as well as mitosis In case of Trisomy 21 also called as Downs syndrome there is an additional See Answer

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