Chapter 11.2: Features of Meiosis

Question 1

Define meiosis II

Answer 1

the second round of division in meiosis, during which the two haploid cells from meiosis I undergo a mitosis-like division without DNA replication to produce four haploid daughter cells

Question 2

What is in meiosis, the exchange of corresponding chromatid segments between homologous chromosomes; responsible for genetic recombination between homologous chromosomes?

Answer 2

crossing over

Question 3

What is the point-by-point alignment (pairing) of homologous chromosomes that occurs before the first meiotic division; crossing over takes place during this?

Answer 3

synapsis

Question 4

What is a protein lattice that forms between two homologous chromosomes in prophase I of meiosis, holding the replicated chromosomes in precise register with each other so that base-pairs can form between nonsister chromatids for crossing over that is usually exact within a gene sequence?

Answer 4

synaptonemal complex

Question 5

What is the second round of division in meiosis, during which the two haploid cells from meiosis I undergo a mitosis-like division without DNA replication to produce four haploid daughter cells?

Answer 5

meiosis II

Question 6

What is the first round of cell division in meiosis; it is referred to as a “reduction division” because homologous chromosomes separate, and the daughter cells have only the haploid number of chromosomes?

Answer 6

meiosis I

Question 7

What are chiasmata?

Answer 7

 The sites of crossing over are called chiasmata and these sites of contact are maintained until anaphase I

Question 8

Define meiosis I

Answer 8

the first round of cell division in meiosis; it is referred to as a “reduction division” because homologous chromosomes separate, and the daughter cells have only the haploid number of chromosomes

Question 9

What is a tetrad or bivalent?

Answer 9

paired homologues, each composed of two sister chromatids called a tetrad or bivalent

Question 10

Define synaptonemal complex

Answer 10

a protein lattice that forms between two homologous chromosomes in prophase I of meiosis, holding the replicated chromosomes in precise register with each other so that base-pairs can form between nonsister chromatids for crossing over that is usually exact within a gene sequence

Question 11

Define crossing over

Answer 11

in meiosis, the exchange of corresponding chromatid segments between homologous chromosomes; responsible for genetic recombination between homologous chromosomes

Question 12

Define synapsis

Answer 12

the point-by-point alignment (pairing) of homologous chromosomes that occurs before the first meiotic division; crossing over takes place during synapsis