Module 1.2 Meiosis Second Div + conclusion

Question 1

During the ___ stage, each ___ divides into two and thus two pairs of it are formed. Each pair migrates to the opposite pole, microtubules form a spindle again.

Nuclear membrane and Nucleolus disappear

Answer 1

Prophase II

centriole

Question 2

During the ___ stage, chromosomes arrange themselves on the equator. Chromosome produces two ___ or ___. Spindle attach to ___ through ___.

Answer 2

Metaphase II

monads or daughter chromosomes

centromere
kinetochore

Question 3

During the ___ stage, daughter chromosomes move towards the opposite poles due to the shortening of the ___ and stretching of ___ of the spindle.

Answer 3

Anaphase II

chromosomal microtubules

interzonal microtubules

Question 4

During the ___ stage, endoplasmic reiculum forms nuclear envelope around chromosome and nucleolus reappears. Karyokinesis and cytokinesis occur and ___ are formed.

Answer 4

Telophase II

Four haploid cells

Question 5

Significance of meiosis (2)

Answer 5

1 definite number of chromosomes in organisms

2. Crossing over allows exchange of genes thus variation

Question 6

Meiosis occurs in the ___ cells of sexually reproducing organisms. And these cells are localized in the ___.

Answer 6

Germ

Gonads

Question 7

___ or ___ is found in animals and a few lower plants. Meiotic division occurs immediately before the formation of ___ or ___.

Meiosis takes place in the gonads and results in the formation of gametes.

Answer 7

Terminal or Gametic meiosis

gametes or gametogenesis

Question 8

During this type of life cycle, a reproductive cell reproduces haploid gametes (egg and sperm) to make zygote.

Answer 8

Gametic life cycle

Question 9

___ or ___ is characteristic of flowering plants. Just before flowering or between fertilization and formation of gametes. It is involved in the production of ___ in ___ (___) and ___ in ___ or ___(___)

Answer 9

Intermediary or sporic meiosis

microspores in anthers (microsporogenesis)

megaspores in ovary or pistil (megasporogenesis)

Question 10

Long dominant diploid and multicellular generation :

Short, multicellular haploid generation:

Answer 10

Sporophyte

Gametophyte

Question 11

___ or ___ occurs in some algae, fungi, and diatoms. Meiotic division occurs immediately after fertilization. The most simple sexual life cycle is called the ___.

These organisms are ___ during most of their life cycle. The zygote is the only ___ phase.

Answer 11

Initial or zygotic meiosis

zygotic life cycle

Haploid
Diploid

Question 12

Onion scientific name

Answer 12

Allium cepa