genetics - limestone district school...
TRANSCRIPT
GENETICS
Agenda● Review
● Notes
REVIEW
What is Genetics?
● Studying heredity and the variation
of inherited characteristics
● Studying heredity and the variation
of inherited characteristics
Cell Cycle
● Cells reproduce through a
continuous sequence of growth and
division known as the cell cycle● Interphase + Mitosis (+ cytokinesis)
Cell division/Cell cycle
CLONING
What is cloning?
● Process of forming IDENTICAL offspring from a single cell or tissue
● Does not result in the variation of traits that would occur with the combination of male and female sex cells
● Therefore, ASEXUAL REPRODUCTION
Natural clones
● Identical twins
● Plant cutting○ grafting
Natural clones
Artificial clones
● Made in the lab → THANKS to genetic
engineering○ Intentional production of new genetic
material by substituting or altering existing material
● Two ways○ Artificial embryo twinning○ Somatic cell nuclear transfer
Somatic Cell Nuclear Transfer (SCNT)
● Somatic cell: any cell in the body other
than sperm and egg - has two complete
sets of chromosomes (46 chromosomes)
● Nuclear: nucleus is a compartment that
holds the cell’s DNA
● Transfer: moving an object from one
place to another
1996 - First mammal created by SCNTSheep (Dolly) - Ian Wilmut and Keith Campbell
Normal Development
● Embryonic cells
→
differentiation →
different cells
● Shut down genes
they don’t need
for specific
functions
WHY CLONE?