Question

Difference between subphase and prophase 1 of meiosis 1

Answer 1

There are two major differences between mitosis and meiosis. First, meiosis involves not one, but two cell divisions. ... Whereas somatic cells are diploid, meaning they have two copies of each chromosome, germ cells are haploid. The haploid nature ofgerm cells is vital to the process of sexual reproduction.

Answer 2

Answer:

Propahse I- It is the longest phase of meiosis,Three major event occur in propahse I, that are- condensation of chromatin into chromosome, next is formation of synapsis, and finally crossing over. These events occurs in 5 substeps:

A) Leptonema- A cell destined to become a gamete enters this stage. In this step chromatin condensation takes place to form a chromosome structure.

B) Zygonema- In this stage, the homologous pairs of chromosomes to form a Synapse. The pairing or coming together of homologous chromosomes is called synapsis. This is also known as synaptonmal complex. The pairing may start at any part of the chromosomes, e.g. near the end or near the centromere. The pairing is also highly specific, i.e. homologous chromosomes that come in pairs must be of equal length and have the same centromere position. The paired chromosomes are called bivalent or tetrad chromosomes.

C) Pachytene- In this stages, there is the chaismata formation takes place where crossing over occurs. During the crossing over there is actual physical exchange of the segment of the chromosomes takes place. This is known as recombination.

D) Diplotene- Once the crossing over is accomplished the chromosome pairs begins to separate. The chromosomes uncoil slightly to allow DNA transcription.

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