Lecture notes
Lecture notes Unit 15 - Inherited Change
- Module
- Unit 15 - O Inherited Change
- Institution
- CIE
Summary notes for unit 15 inherited change a level cie biology
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DIPLOID HAPLOID2 complete sets of 1
complete set
of
chromosomes chromosomes
[ 2N] [ no ]
chromosomes
Homologous : Two chromosomes that
◦
the same
carry
in the
genes
same position
◦
Gametes are haploid
MEIOSIS
the nuclear division that results in the production
the chromosome
of four daughter cells with
half
with
number the
of parent cell and reshuffled alleles
◦
[ reduction division ]
chromosomes are halved diploid
to haploid [ no] cells
from [2N]
leads
natural genetic
causes variation
for gametes which to
◦
selection
allele varied / alternative
form of
◦ →
gene
a
( next )
page
, Meiosis 1-
> CENTROSOMES
( → NUCLEAR
ENVELOPE
tA_RY PROPHASE 1
condenses and becomes
0
DNA
visible as chromosomes
chromosomes pain
EB
NUCLEOLUS
◦
Homologous
up in bivalent
move to the
◦ centrosomes
opposite ends of nucleus
HOMOLOGOUS PAIRS OF CHROMOSOMES ( Bivalent )
LATE PROPHASE L NUCLEAR ENVELOPE
crossing ofat whichsister chromatids
◦
over non
-
◦
chiasma 8 point over
spindles
crossing
◦
formed occurs 88
]
are
◦
nuclear Envelope and nucleolus breaks
down
CROSSING OVER
METAPHASE 1-
⇐§☒ ◦
The biv alerts line up the
along
equator the spindle , with the
of spindle
attached to the centromeres
fibres
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