Prophase I

Question 1

Leptonema

Answer 1

Partial condensation of chromatin, creating chromomeres

Homology search: maternal homologs search for matching homolog

Question 2

Zygonema

Answer 2

Bivalents: two thicker more condensed homologous chromosomes, partially condensed

Rough pairing

300nm apart

Question 3

Pachynema

Answer 3

Chromosomes become thicker and chromatids become visible

Chromosome tetrad structure

100nm apart (synapsed)

Genetic material is mixed (maternal and paternal)

Question 4

Diplonema

Answer 4

Homolog pair separate slightly

The chiasma is terminated at the end of diplonema

Question 5

Diakinesis

Answer 5

Chiasma continue to terminate at telomeres

Synapse disappears

Nuclear envelope disappears

Spindle attach time kinetochores