The Process of Mitosis and Meiosis in Watermelons
Mitosis in Watermelons
Watermelons grow from small to large
through the process of Mitosis.
Interphase
•
Chromosomes
begin to duplicate
Each bean
represents 1
chromosome.
Watermelons have
22 chromosomes
Nucleus
Prophase
•
Each
chromosome now
has a duplicate
•
Each pair is called
a “Sister
Chromatid”
Nuclear envelope
breaks down
Spindle fibers start
to form
Metaphase
•
Chromosomes
line up in the
middle
•
Spindle fibers are
attached
Anaphase
•
Sister Chromatids
separate
Telophase
•
“Cytokinesis”
–
The division of
the cytoplasm to
form two new
cells
–
Each cell has a
complete set of
22 chromosomes.
–
Both cells are
genetically
identical.
Cell plate forms to
divide the 2
daughter cells
Nuclear membrane
re-forms
Meiosis in Seeded
Watermelons
Meiosis takes place in the flower of a
watermelon plant to produce gametes.
Male flowers produce
pollen and sperm
(male gamete).
Female flowers produce
eggs inside the ovule
(female gamete).
When pollen carrying sperm
from the male flower reaches
the ovule of the female flower, a
watermelon fruit begins to form
Prophase I
•
DNA coils
making
chromosomes
•
Homologous
chromosomes pair
in synapsis
•
Crossing-over
occurs
Tetrads (4) form
Metaphase I
•
The nuclear
membrane
disappears
•
Spindle forms
•
Fibers attach
Anaphase I
•
Spindle fibers
shorten and move
homologous
chromosomes to
opposite sides
Telophase I
•
Nuclear
membrane
reforms around
the daughter
nuclei
•
Chromosomes are
still attached to a
common
centromere
Each chromosome consists of 2
sister chromatids which are not
identical due to crossing over
Nuclear membrane
re-forms
Prophase II
•
Nuclear
envelopes break
down
•
New spindle
forms
Metaphase II
•
New spindle
fibers form and
attach to each side
of the centromere
Anaphase II
•
Spindle fibers
contract
•
Sister chromatids
move toward
opposite poles
Telophase II
•
Nuclear
envelopes reform
around the
daughter
chromosomes
•
Chromosomes
unwind
•
4 haploid cells
result
Meiosis in Seed
less
Watermelons
Diploid Flower cross pollinates with a
tetraploid flower
Resulting in a triploid offspring
which is sterile and does not
produce seeds.
Watermelons undergo the processes of mitosis and meiosis to grow and reproduce. During mitosis, watermelons develop through interphase, prophase, metaphase, anaphase, and telophase. In meiosis, seeded watermelons produce gametes through prophase I, metaphase I, anaphase I, and telophase I. Both processes play crucial roles in the growth and reproduction of watermelon plants.
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Presentation Transcript
Mitosis in Watermelons Watermelons grow from small to large through the process of Mitosis.
Interphase Chromosomes begin to duplicate Each bean represents 1 chromosome. Watermelons have 22 chromosomes Nucleus
Prophase Each chromosome now has a duplicate Each pair is called a Sister Chromatid Spindle fibers start to form Nuclear envelope breaks down
Metaphase Chromosomes line up in the middle Spindle fibers are attached
Anaphase Sister Chromatids separate
Telophase Cytokinesis The division of the cytoplasm to form two new cells Each cell has a complete set of 22 chromosomes. Both cells are genetically identical. Nuclear membrane re-forms Cell plate forms to divide the 2 daughter cells
Meiosis in Seeded Watermelons When pollen carrying sperm from the male flower reaches the ovule of the female flower, a watermelon fruit begins to form Male flowers produce pollen and sperm (male gamete). Female flowers produce eggs inside the ovule (female gamete). Meiosis takes place in the flower of a watermelon plant to produce gametes.
Prophase I DNA coils making chromosomes Homologous chromosomes pair in synapsis Crossing-over occurs Tetrads (4) form
Metaphase I The nuclear membrane disappears Spindle forms Fibers attach
Anaphase I Spindle fibers shorten and move homologous chromosomes to opposite sides
Telophase I Nuclear membrane reforms around the daughter nuclei Chromosomes are still attached to a common centromere Nuclear membrane re-forms Each chromosome consists of 2 sister chromatids which are not identical due to crossing over
Prophase II Nuclear envelopes break down New spindle forms
Metaphase II New spindle fibers form and attach to each side of the centromere
Anaphase II Spindle fibers contract Sister chromatids move toward opposite poles
Telophase II Nuclear envelopes reform around the daughter chromosomes Chromosomes unwind 4 haploid cells result
Meiosis in Seedless Watermelons Resulting in a triploid offspring which is sterile and does not produce seeds. Diploid Flower cross pollinates with a tetraploid flower
