Cambridge International AS & A Level Complete Biology
Hi everyone:)) Here are my CIE A2 level Biology topic notes for the syllabus. These notes are tailored to the A level syllabus as well as the mark scheme as if you do enough past paper questions you will see a recurring pattern with the types of questions asked about each topic. My notes include s...
if diploid 12h1 parents were used 12h -12h =
4h )
DI DI will not be continued Therefore
species
= .
DI t 1) It =
PMATXZ 2h
parents must make so nth :
n ,
=
NORMAL DIPLOID NUMBER RESTORED
•
homologous chromosomes •
[ mother p
father
since in fertilisation nth =
2h somatic cells must have 1 ✗ maternal set and I ✗ paternal set
,
sgY§
Pair 23 =
Pair of sex chromosomes
Each pair : some
genes in the same position ( loci ) on the chromosome
:
not necessarily the same forms of allele
of the gene
:
some length and overall size
:
centromere et same
position
:
one chromosome of maternal origin , one chromosome at
paternal
:
some bending
:
come tgt + pair up at Prophase I
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