Reproduction Flashcards
Centromere:
What binds together the chromatids
Autosomal chromosomes:
Chromosomes numbered 1-22
Cytokinesis:
When the daughter cells are produced
Diploid:
A cell with 23 chromosome pairs.
Abbreviation for diploid
2n
Abbreviation for haploid
N
Gamete
Sex cell/ germ cell
Sperm/egg
Germ cell:
Sex cell
Haploid:
Cell with only 23 chromosomes
Meiosis
Reproduction of sex cells
Mitosis:
Reproduction of body cells
Somatic cells
Cells produced by mitosis with a complete number of chromosomes.
Tetrad
When the four chromosomes stay very close together.
Crossing over
When the homologous chromosomes exchange one or more of their genes with eachother.
Zygote
The cell formed when two sex cells (sperm and egg) unite.
Order of mitosis stages
Interphase, prophase, metaphase, anaphase, telophase
Spermatogenesis produces
4 sperms
Oogenesis produces
One single egg
Germ cell=
Spermatogonium or oogonium
Spermatogonium and oogonium are found
In the body
The polar bodies produced in oogenesis don’t
Enter the ovaries
Start with germ cell and end with
Sperm or egg
Purpose of mitosis in multicellular organisms
GRR Grow Replace Repair (Asexual Reproduction)
Purpose of meiosis in multicellular organisms:
Gamete production (sex cell production) For sexual reproduction
Number of daughter cells produced in mitosis
2
Number of daughter cells produced in meiosis
4
Number of chromosomes in parent cell mitosis:
46
Number of chromosomes in parent cell meiosis:
46
Number of chromosomes in one daughter cell mitosis:
46
Number of chromosomes in one daughter cell meiosis:
23
Daughter cells mitosis:
Diploid (2n)
Daughter cells meiosis:
Haploid (n)
Daughter cells genetically identical to parent in mitosis?
Yes
Daughter cells genetically identical to eachother in mitosis?
Yes
Daughter cells genetically identical to parent in meiosis:
No
Daughter cells genetically identical to eachother in meiosis:
No
First stage of cell cycle:
G1
What is g1
Growth
Second stage of cell cycle
S
What occurs in S
Growth and DNA replication
Stage 3 of cell cycle:
G2
What is g2
Growth and final prep for division
What is stage 4 of cell cycle?
M
Four(or five) steps in m
Prophase, metaphase, anaphase, telophase, cytokinesis
What is the result of the cell cycle
New daughter cells created
What are G1,2 and S part of
Interphase
Which part of the m phase is not considered part of the mitotic phases?
Cytokinesis
When the chromosomes copy and condense they form
Chromatids
I’m pulling my act together
Interphase prophase metaphase anaphase telophase
Kinetochore:
Specialized region on centromere that links each sister chromosome to the mitotic spindle.
Another word for ovum
Egg
Fusion of gametes=
Fusion of gametes