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Flashcards in 10.1 Meiosis Deck (6)
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1

Define interkinesis

An optional rest period between meiosis I and meiosis II, no DNA replication occurs in this stage

2

Outline the formation of chiasma

• During synapsis in Prophase I, homologous chromosomes form tetrads
• Portions of non-sister chromatids overlap, break at chiasmata, reattach to new non-sister chromatid in a system of reciprocal exchange
• New combinations known as recombinants

3

Explain how genetic variety is produced through independent assortment

• Variety produced by recombination of maternal and paternal chromosomes
• For each pair of homologous chromosomes, maternal and paternal chromosomes assort to daughter cells randomly

4

Explain how genetic variety is produced through crossing over

• Variety produced by recombination within individual chromosomes
• During synapsis in Prophase I, homologous chromosomes form tetrads
• Portions of non-sister chromatids overlap, break at chiasmata, reattach to new chromatid in a system of reciprocal exchange
• New combinations known as recombinants

5

State Mendel's law of independent assortment

"Two or more pairs of alleles assort independently of one another during gamete formation"
• This law states that allele pairs separate independently during the formation of gametes
• Therefore, traits are transmitted to offspring independently of one another

6

Explain the relationship between Mendel's law of independent assortment and meiosis

• Mendel’s law of independent assortment applies only to traits carried on different chromosomes (unlinked genes)
• Independent assortment occurs as a result of the alignment of homologs during Metaphase I, determining which maternal and paternal chromosomes assort to each daughter cell
• Each pair of alleles separates independently of every other pair of unlinked alleles