Question

difference between zygotene and leptotene

Answer 1

Zygotene is the sub-stage where synapsis between homologous chromosomes begins. It is also known as zygonema. These synapsis can form up and down the chromosomes allowing numerous points of contact called 'synaptonemal complex', this can be compared to a zipper structure, due to the coils of chromatin.

The leptotene stage, also known as the leptonema, is the first of five substages of prophase I in meiosis. ... The next stage of prophase I in meiosis is the zygotene stage. During this stage, the chromosomes attach themselves by their ends (telomeres) to the inner membrane of the nuclear envelope.

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Answer 2

Ans.

Zygotene and leplotene are stages prophase I of meiotic cell division. Leptotene shows first stage of prophase I, in which each chromosome, having two sister chromatids, becomes visible as individualized chromosome. The closely associated sister chromatids can be visually distinguished from one another.

Zygotene is second stage of prophase I, in which chromosomes line up with other chromosomes into homologous pairs of chromosomes. During zygotene, synapsis (pairing of chromosomes) occurs between homologous chromosomes that include formation of bivalent or tetravalent cheomosomes.