Question

Euploid changes occur by which of the following developmental errors. A. Non-disjunction during Anaphase I of meiosis. B. Non disjunction during Anaphase II of meiosis. C. Failure of cell division and production of unreduced gametes during meiosis. D. Somatic doubling in the meristem leading to reproductive organs. E. Both A and B are correct. F. Both C and D are correct. G. All the answers are correct.

Answer 1

Answer:

A. Non-disjunction during Anaphase I of meiosis.

Explanation:

Euploidy is an alteration in the organism´s natural number of chromosomes. Individuals with euploidy express a different number of homologous chromosomes set than the one from the normal number.

The cause of this alteration is that homologous chromosomes do not separate during the anaphase of meiosis 1.

There are two types of euploidy:

• Polyploidy: Increase in the number of chromosomes characteristic of a diploid complement. During anaphase 1, homologous chromosomes do not separate and migrate together to the same pole. One of the resulting gametes ends with the whole chromosomic material, while the other cell ends with non. The first one goes through the second phase of meiosis and forms two diploid gametes.
• Monoploidy: Decrease in the normal number of chromosomes. The individual only gets one set of chromosomes. This is a monoploid organism, n.