Meiosis

Question 1

A type of cell division where the sex cells divides and reduces to produce 4 gamete cells.

Answer 1

Meiosis

• Meiosis is SEXUAL reproduction
• Includes TWO divisions

Question 2

It is the reproductive cell of an animal or plant.

Answer 2

Gametes

• Female; Egg cell / Oogenesis
• Male; Sperm cell / Spermatogenesis

Question 3

What is a cell containing two copies of each chromosome?

Answer 3

Diploid

(2n)

Question 4

What is a cell containing a single set of chromosome?

Answer 4

Haploid

(n)

Question 5

What type of cell contains half the number of chromosomes?

Answer 5

Gamete

• Female; Egg cell / Oogenesis
• Male; Sperm cell / Spermatogenesis

Question 6

Where does meiosis occur?

Answer 6

Gonads

• Testes
• Ovaries

Question 7

How many phases does meiosis have?

Answer 7

8

• 4 phases in Meiosis I
• 4 phases in Meiosis II

Question 8

When does the homologous chromosomes seperate?

Answer 8

Meiosis I

Produces two haploid cells, each containing one chromosome from the homologous pair

Question 9

When does the sister chromatids seperate?

Answer 9

Meiosis II

Question 10

What is the group of four sister chromatids in paired homologous chromosomes?

Answer 10

Tetrad

Question 11

What is the pairing of homologous chromosomes called?

Answer 11

Synapsis

Question 12

It is the recombination of alleles or genetic material in homologous chromosomes.

Answer 12

Crossing-over

• Happens during Prophase I (Pachytene)

Question 13

What is the different versions of the same gene on each chromosome called?

Answer 13

Allele

Question 14

What is the pair of chromosomes similar in shape and size called?

Answer 14

Homologous Chromosome

• Maternal and Paternal

Question 15

How many pairs of homologous chromosomes does a human have?

Answer 15

23 Pairs

• 22 pairs Autosomes (body)
• 1 pair Sex chromosomes

Question 16

It is the the point of contact between two non-sister chromatids.

Answer 16

Chiasmata

Question 17

What may occur between
non-sister chromatids at sites called chiasmata?

Answer 17

Crossing-over

• Causes Genetic Recombination

Question 18

What is the longest and most complex phase in meiosis?

Answer 18

Prophase I

Question 19

What stage does the chromosome starts to condense.

Answer 19

Leptotene

Prophase I (1st Stage)

Question 20

What is the fertilized egg cell that results from the union of a female gamete with a male gamete?

Answer 20

Zygote

Question 21

It is the phase where the cell duplicates its DNA.

Answer 21

Interphase

Can be found both in Mitosis and Meiosis

Question 22

It is the phase where the sister chromatids can be clearly seen.

Answer 22

Prophase I

First Phase of Meiosis I

Question 23

It is the phase where the Nucleus & Nucleolus disappear.

Answer 23

Prophase I

First Phase of Meiosis I

Question 24

It is the phase where the spindle fiber forms.

Answer 24

Prophase I

First Phase of Meiosis I

Question 25

It is the phase where Tetrads form & Crossing over Occurs

Answer 25

Prophase I ## Footnote First Phase of Meiosis I

Question 26

It is the phase where Chromosomes coil & Synapsis occurs.

Answer 26

Prophase I ## Footnote First Phase of Meiosis I

Question 27

Which phase is the shortest in Meiosis?

Answer 27

Metaphase I ## Footnote Second Phase of Meiosis I

Question 28

At which stage does the chromosomes begin to pair of?

Answer 28

Zygotene ## Footnote Priphase I (2nd Stage)

Question 29

At which stage does crossing over happen?

Answer 29

Pachytene ## Footnote Prophase I (3rd Stage)

Question 30

At which stage does the chromosome begin to uncoil?

Answer 30

Diplotene ## Footnote Prophase I (4th Stage)

Question 31

It is the stage where the homologous chromosomes continue to separate.

Answer 31

Diakinesis ## Footnote Prophase I (5th Stage)

Question 32

How many substages does Prophase I have?

Answer 32

5 ## Footnote 1. Leptotene 2. Zygotene 3. pachytene 4. Diplotene 5. Diakinesis

Question 33

In which phase does the homologous chromosomes (or tetrads) align on the equitorial plate (or equator)?

Answer 33

Metaphase I

Question 34

It is the central plane of the spindle in dividing cell, to which chromosomes migrate during the metaphase of Mitosis or Meiosis.

Answer 34

Equitorial Plate

Question 35

It is when Independent assortment occurs where the chromosomes separate randomly causing Genetic Recombination.

Answer 35

Metaphase I

Question 36

In which stage does the Homologous Chromosomes separate and move towards the opposite poles.

Answer 36

Anaphase I ## Footnote Sister Chromatids remain attached at their centronomes

Question 37

It is when each pole now has a haploid set of chromosomes.

Answer 37

Telophase I

Question 38

Which meiosis is a process of reduction of chromosome?

Answer 38

Meiosis I

Question 39

Which division separates the chromosomes into two chromatids?

Answer 39

Meiosis II

Question 40

This stage has no interphase and no DNA replication.

Answer 40

Meosis II

Question 41

Which stage in Meiosis is very similar to Mitosis?

Answer 41

Meiosis II

Question 42

It is the phase in meiosis where the Nucleus & nucleolus disappear, chromosomes condense, and spindle forms.

Answer 42

Prophase II

Question 43

It is the phase in Meiosis where chromosomes (not homologous) line up at equator.

Answer 43

Metaphase II

Question 44

It is the phase in Meiosis where Nuclei & Nucleoli reforms and the spindle fiber disappears. | Produces 4 Haploids

Answer 44

Telophase II

Question 45

It is the fusion of sperm and egg cell to form a zygote.

Answer 45

Fertilization ## Footnote - Egg (n = 23) ; Zygote (n = 46) - Sperm (n = 23)