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- AQA
Summary of 14 pages for the course Unit 4 - Genetic information, variation and relationships between organisms at AQA (Notes)
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DNA ,Genes and protein synthesis
DNA that contains coded into for
gene section of making polypeptides and
·
:
functional RNA
·
A
gene is located at a
particular position ,
called a locus , on a DNA molecule
histones that are associated w/ DNA form chromosomes
· :
proteins to
& fechromand
>
- centromere
08
, DNA AND CHROMOSOMES
Gene of DNA that codes for characteristic
-
S
: section a
·
Allele :
different form of a
gene
·
chromosome : DNA
wound up
·
Gene :
section of DNA that codes for making a
polypeptide and
functional RNA
>
-
code is a
specific sequence of bases
·
locus : location of a certain gene on a chromosome
·
Allele :
different form of the same gene
· chromosome how DNA is stored :
↳
tightly coiled DNA
>
-
located in the nucleus
>
-
23
pairs of chromosomes in human
8 of
&
chromatic
e
>
-
centomer
BOTH ARE CHROMOSOMES
↓
chromosome when
! chromosome after
DNA replication (interphase)
no cell division occurs
·
Homologous pairs :
pair of chromosomes with the same genes but might
have different alleles
>
-
occurs
during fertilisation of and sperm
egg
·
chromosomes are linear
·
DNA tightly wound around
proteins called histones to fit in the nucleus
as chromosomes
·
nucleosome :
DNA wrapped around a histone
·
Prokaryotes : also carries DNA in chromosomes
-
DNA is shorter and circular
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