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WorksheetsMeiosis
Total questions: 18
Worksheet time: 5hrs 30mins
Purpose of Meiosis I
Bivalent are oriented randomly! All chromosomes are mixed up randomly. ( Lots of diversity
To create 2 daughter cells, each with 1 set of chromosomes. 1 Copy instead of 2 (going from Diploid to Haploid)
anywhere there's an identical stretch of DNA sequence, the DNA mixes together
each haploid split again, making 4 daughter cells (all haploid)
**Half amount of DNA goes into the daughter cells)
Purpose of Meiosis II
Bivalent are oriented randomly! All chromosomes are mixed up randomly. ( Lots of diversity
To create 2 daughter cells, each with 1 set of chromosomes. 1 Copy instead of 2 (going from Diploid to Haploid)
anywhere there's an identical stretch of DNA sequence, the DNA mixes together
each haploid split again, making 4 daughter cells (all haploid)
**Half amount of DNA goes into the daughter cells)
where homologous pairs join up as a team, and form a bivalent
Synapsis
Metaphase I
Law of Segregation
Nondisjunction
What happens in Prophase I
Crossing over occurs, anywhere there is an identical stretch of DNA sequence, the DNA mixes together (this is why every human looks different, and we are not identical to 1 parent)
Chromosomes condense, centro mere forms, and the nuclear envelope disappears
We want each daughter cell to get a complete set of chromosomes. To ensure this, Synapsis occurs
Spindles attach at Kinetochores, and the spindles pull on chromosomes which makes them line up in the middle of the cell
Prometaphase I and Metaphase I
Spindles attach at Kinetochores, and the spindles pull on chromosomes which makes them line up in the middle of the cell
Bivalents are oriented randomly! All chromosomes are mixed up randomly.
Spindles pull apart the homologous chromosomes, but sister chromatids stay together!
Now that we don't have any homologous pairs, they don't need to be lined up because there is ONLY ONE COPY OF THE CHROMOSOME
In what Phase do spindles pull apart the homologous chromosomes, but sister chromatids stay together!
Prophase I
Anaphase I
Prophase II
Anaphase II
When the daughter cells are ready to separate and move into Prophase II, they are in
Metaphase II
Telophase I and cytokinesis
Prophase II
Anaphase I
True or False:
In Prophase II and Prometphase II: Chromosomes condense and the nuclear envelope disappears, Spindles attach to kinetochores on chromosomes. And now there is only ONE copy of the chromosomes
True
False
During Metaphase II, ______ align in the ____
(a)
In (a) sister chromatids are separated
What happens in Telophase II and Cytokinesis
chromosomes separate and become new daughter cells
now we have 4 haploid daughter cells.
now we have 2 diaploid daughter cells
Chromosomes become one cell
Independent Assortment:
Each daughter cell becomes a haploid
each daughter cell gets a random assortment of maternal and paternal chromosomes.
WHEN DNA sequence mixes together, this is why you look different from your sibling.
When RNA mixes
Random Fertilization
ensures a unique unit of gametes, even if self fertilization occurs (plants)
alleles separate into different gametes
Each parent contributes one allele and you have 2 of each if diploid.
ensures offspring is different than the parent.
Mitosis has __ number of divisions and meiosis has __.
(a)
Synapsis ONLY occurs in Meiosis
False
True
Mitosis has 4 daughter cells and Meiosis has 2
True
False
The daughter cells are genetically identical in both mitosis and meiosis
False
True
Nondisjunction is
chromosomes separate and become new daughter cells
To create 2 daughter cells, each with 1 set of chromosomes. 1 Copy instead of 2 (going from Diploid to Haploid)
Things do not separate correctly. BOTH homologous chromosomes get put into one cell and none into the other (2 daughter cells w extra chromosome and 2 w missing chromosomes)
Spindles attach at Kinetochores, and the spindles pull on chromosomes which makes them line up in the middle of the cell
