Meiosis Flashcards
(25 cards)
Meiosis meaning
Process where GAMETES are formed in humans this is sperm and eggs.
If a cell has 46 chromosomes, whey does a
sperm/egg have 23?
When the sperm fertilizes and egg, together it is 46 and becomes a human
What to scientists call Meiosis
A reduction/division starts with 46 and ends
with 23 for each sperm and egg.
Definition of Gametes
Gametes are an organism’s reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm.
The stage before Meiosis?
Interphase= cell grows, DNA replication,
Cell functions.
What does PMAT stand for?
Prophase, Metaphase, Anaphase,
Telophase
In Mitosis you divide PMAT on once. How many times do you divide Meiosis?
Twice. So Meiosis has a number. Like Prophase1.
What happens in Prophase?
Cell condenses, and thickens, and line up with homologous pairs
What is a Homologous chromosomes
chromosomes same size, location, and
type of genes
What is CROSSING OVER in Prophase.
Lined up in genetic pairs, they transfer
genetic information. Genetic information
exchange.
How does Crossing Over help variety
It make RECOMBINANT Chromosomes
which variety, like 2 brothers, same parents, different color eyes or hair.
How to remember Metaphase
The M stands for Middle. Chromosomes in the middle of the cell, the chromosomes are lined up in pairs in the middle, not single
file line.
Remembering Anaphase.
Remember the A stands for AWAY. The chromosomes are going to be pulled away by the spindle fibers on the side.
How to remember Telophase stage
Telephase remember T for Two. It ends in TWO cells.
Meiosis 2 Metaphase
Cells lined up in single file-no pairs.
Anaphase 2 Remember A for a way.
The chromotids are pulled to the side by the spindle fibers.
Telephase 2
Nuclei reforming, the two cells are divided.
4 cells forming. Cytokenisis follows and splits the cytoplasm.
Meiosis in males produces sperm
what does it produce in females.
eggs. sperms cells are all different which leads to variety.
what is NON DISJUNCTION?
Chromosomes don’t seperate completely.
A cell receives to many or to few chromosomes in the seperation.
What is in sperm
Nuclear material with chromosomes.
IN meiosis whey are family members difference looking.
If everyone was genetically the same, they would all be succseptable to the same dieseases.
What is a DIploid, and what is a Haploid?
Diploid 2 sets of chromosomes. Haploid
is one set of chromosomes.
How many pairs of chromosomes do we have?
23…. 46 total.
What is human life cycle.
Meiosis make Gametes (sperm or eggs), Gametes-fertilized-this created a zygote.
