Question

In which stage of prophase holliday function form?

Answer 1

Answer:

Crossing over occurs between prophase I and metaphase I and is the process where two homologous chromosome non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.

Answer 2

Answer:

Most of the events that function to differentiate meiosis from mitosis occur in Prophase I

Homologous chromosomes form bivalents (or tetrads) and crossing over occurs between non-sister chromatids

Prophase I is divided into 5 distinctive sub-stages:

• Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres
• Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes
• Pachytene – Crossing over of genetic material occurs between non-sister chromatids
• Diplotene – Synapsis ends with disappearance of synaptonemal complex; homologous pairs remain attached at chiasmata
• Diakinesis – Chromosomes become fully condensed and nuclear membrane disintegrates prior to metaphase I

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