Variation in chromosome structure and number - Natural and experimental mechanisms that produce variation in chromosome number

4 important questions on Variation in chromosome structure and number - Natural and experimental mechanisms that produce variation in chromosome number

What is the  problem with meiotic nondisjunction, in contrast to mitotic nondisjunction?

When a cell with too many or too few chromosomes give rise to a gamete that fuses with a normal gamete, the resulting offspring will have an abnormal chromosome number in all of its cells.

To what does mitotic nondisjunction lead?

When it occurs during embryonic stages of developmment, it may lead to a patch of tissue in the organism that has an altered chromosome number.

What happens when nondisjunction occurs during meioseis I?

All 4 resulting haploid cells are abnormal, in the cells that have 2 haploid copies of one chromosome, the chromosomes are from both parents from the parent.
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What happens when nondisjunction occurs during meiosis II?

Two cells are normal and two abnormal. The copies of one chromosome are from the same parent (grandparent from the offspring).

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