Question

The random alignment of the tetrads along the equatorial plate; occurs during metaphase I?

Answer 1

During metaphase I of meiosis, tetrads align randomly at the metaphase plate, which ensures genetic variation in the resulting gametes due to independent assortment.

Step-by-step explanation:

The student's question relates to metaphase I of meiosis, a critical phase in cell division where genetic diversity is introduced into the resulting gametes. During this phase, tetrads, which have formed during earlier prophase I, align at the equator of the cell to form what is known as the metaphase plate. This alignment is random with respect to the maternal and paternal origin of each chromosome that makes up the tetrad.

Owing to this, there is an equal chance of microtubule fibers connecting to either the maternal or paternal chromosome, leading to independent assortment. This leads to numerous possible combinations when these pairs are eventually separated, contributing to genetic variation in the offspring.

Answer 2

Yes, the random alignment of the tetrads along with the equatorial plate occurs during metaphase I.

Step-by-step explanation:

After the crossing-over in prophase I, and during metaphase I, fibers of the spindle apparatus capture chromosomes and take them toward the center of the cell, to the metaphase plate. The homologous pairs of chromosomes get aligned in the metaphase plate for their posterior separation in anaphase I.

Each chromosome of the pair joins with a microtubule of only one of the spindle poles, so the two equivalent chromosomes join the fibers of opposites poles.

When they align in the center of the cell, their orientation is random.