Here are the answers:1. If n=4 for fruit flies, then the wing cell will have 2n=8 chromosomes.2. If the 2n=86 for a pine tree, then each ovum will have n=43 chromosomes.Mitosis Meiosis Number of Daughter Cells 2 4Number of Cell Division Happening 1 2Type of cell where it is taking place Somatic cells Sex cellsPloidy Level (Before) 2n 2nPloidy Level (After) 2n n
Mitosis produces two daughter cells through one cell division in somatic cells and maintains the same ploidy level (before and after are both diploid). Meiosis produces four daughter cells through two cell divisions in sex cells and reduces the ploidy level by half (before is diploid, after are haploid). Crossing over and independent assortment in meiosis I contributes to genetic variation in the gametes.
Similar to Here are the answers:1. If n=4 for fruit flies, then the wing cell will have 2n=8 chromosomes.2. If the 2n=86 for a pine tree, then each ovum will have n=43 chromosomes.Mitosis Meiosis Number of Daughter Cells 2 4Number of Cell Division Happening 1 2Type of cell where it is taking place Somatic cells Sex cellsPloidy Level (Before) 2n 2nPloidy Level (After) 2n n
Similar to Here are the answers:1. If n=4 for fruit flies, then the wing cell will have 2n=8 chromosomes.2. If the 2n=86 for a pine tree, then each ovum will have n=43 chromosomes.Mitosis Meiosis Number of Daughter Cells 2 4Number of Cell Division Happening 1 2Type of cell where it is taking place Somatic cells Sex cellsPloidy Level (Before) 2n 2nPloidy Level (After) 2n n (20)
Here are the answers:1. If n=4 for fruit flies, then the wing cell will have 2n=8 chromosomes.2. If the 2n=86 for a pine tree, then each ovum will have n=43 chromosomes.Mitosis Meiosis Number of Daughter Cells 2 4Number of Cell Division Happening 1 2Type of cell where it is taking place Somatic cells Sex cellsPloidy Level (Before) 2n 2nPloidy Level (After) 2n n
2. 1. What are the phases of meiosis?
2. What type of cells are made during meiosis?
3. How many chromosomes do sperm cells
have? How about egg cells?
4. In what phase does crossing over happens?
5. What happens during the crossing over of
chromosomes?
6. What causes the variety in genes?
3. The union of two sex cells that
contain one set of chromosome
each and comes from two
individual organisms
4. If the reproductive cycle is to continue, then
the diploid cell must reduce its number of
chromosome sets before fertilization, or
there will be a continual doubling to
fertilization in the number of chromosome
sets in every generation.
5. The number of sets of
chromosomes in a cell
Haploid and Diploid
6. The type of cell division
taking place in sex cells. It
results in haploid
chromosome number.
7. Reduction stage
Synapsis, Crossing over,
and Independent
Assortment happens during
this stage
9. First mechanism that
introduces variation into the
gametes happens here
Synapsis and Crossing Over
10. Pairing of the homologous chromosomes
Homologous chromosomes have the same
length, staining pattern, and centromere
position
A paired homologous chromosome is
composed of four sister chromatids known
as tetrad.
13. The tetrads line up along the
metaphase plate or equatorial
plate of the cell
Spindle fiber increase in
number
14. The second mechanism that
introduces gamete variation happens
here
Independent or Random Assortment
– the arrangement of the tetrads at the
metaphase plate is at random
15. Homologous chromosomes separate and
migrate toward their respective poles
In humans, since there are 46
chromosomes, 23 will move to the poles,
which means that only half of the number
of chromosomes will remain in each cell
16. The two daughter cells are completely
divided
An equal amount of chromosomes are
found in both cells
A nuclear envelope and nuclei reappear
and the chromosomes become less visible
17. Why is meiosis I called the
reduction stage?
The ploidy level has been
reduced from two to one
18. A short pause between meiosis
I and meiosis II
No replication of the
chromosomes happen here
19. Division stage.
Produces four genetically
unique cells
More analogous to mitosis
20. The division of the two
daughter cells with haploid
chromosome numbers
produced in meiosis I
23. 1. What are the phases of meiosis?
2. What type of cells are made during meiosis?
3. How many chromosomes do sperm cells
have? How about egg cells?
4. In what phase does crossing over happens?
5. What happens during the crossing over of
chromosomes?
6. What causes the variety in genes?
43. EVEN IF THE CHROMOSOMES OF THE
FOUR DAUGHTER CELLS IN MEIOSIS
DUPLICATE DURING S PHASE, IT WILL
STILL RESULT IN HAPLOID
CHROMOSOME NUMBER. HOW COME
THE PARENT CELL HAS A DIPLOID
CHROMOSOME NUMBER?
HMMM….
44.
45. 1. If n=4 for fruit flies, how many
chromosome does a wing cell have?
2. If the 2n= 86 for a pine tree, how
many chromosomes does it have in
its ovum?
46. Complete the table below.
Mitosis Meiosis
Number of Daughter Cells
Number of Cell Division Happening
Type of cell where it is taking place
Ploidy Level (Before)
Ploidy Level (After)