103006
Description
Mind Map by abi.harmer, updated more than 1 year ago
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Created by abi.harmer
almost 11 years ago
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what I don't know for SG
- AS
- topic 3
- fertilisation in flowering plants:pollen grain is
attracted by chemicals from the ovule and
grows in a pollen tube towards it. when it gets
there, one nucelus fuses with the female
gamete and the other two go on to make the
endosperm
- fertilisation in mammals: sperm are attracted to the chemical releasedby the egg, when the sperm reach
the egg the acrosome reaction is triggered by chemicals from the follicle cells on the ovum. This
causes the acrosome to swell and fuse with the sperm csm which released digestive enzymes that eat
the zona pellucida. After this the sperm can fuse with the egg's csm. once this happens and the sperm's
nucleus enters, lysosomes in the ovum release enzymes that thicken the zona pellucida so no more
sperm can enter
- meiosis leads to genetic variation
because it recobines alleles in new
ways and there is sometimes crossing
over where bits of chromasome swap
- cell cycle = G1, S,G2,prophase, metaphase, anaphase,
telophase
- root tip squash = aecetic alcohol ---> ice water ----> heated HCL
----> aecetic alcohol ---> maceration --->blot and look at under
microscope
- fertilisation in flowering plants:pollen grain is
attracted by chemicals from the ovule and
grows in a pollen tube towards it. when it gets
there, one nucelus fuses with the female
gamete and the other two go on to make the
endosperm
- topic 4
- Biodiversity is the variety of life in the world
or in a particular habitat or ecosystem
- Endemism is when an organism is
Prevalent in or peculiar to a particular
locality
- Biodiversity is the variety of life in the world
or in a particular habitat or ecosystem
- topic 3
- A2
- DNA profiling relies on introns which are sections of DNA
that dont code for proteins and can therefore be different
without affecting the person
- within introns short dna sequences are repeated many times. the
sequences are known as short tandem repeats (STRs). They can
range from 2 to 50 base pairs and be repeated from 5 to several
hundred times. The same STRs occur at the same place on both
chromosomes of a homologous pair but the number of times they
are repeated can be different. The number of repeats at a locus
also varies between people
- each person has a large number of introns with lots of STR loci. There is a
large variation in the number of repeats at each locus. This means that no
one has the same combination of STRs and we can create a unique DNA
profile
- each person has a large number of introns with lots of STR loci. There is a
large variation in the number of repeats at each locus. This means that no
one has the same combination of STRs and we can create a unique DNA
profile
- within introns short dna sequences are repeated many times. the
sequences are known as short tandem repeats (STRs). They can
range from 2 to 50 base pairs and be repeated from 5 to several
hundred times. The same STRs occur at the same place on both
chromosomes of a homologous pair but the number of times they
are repeated can be different. The number of repeats at a locus
also varies between people
- Enter text here
- DNA profiling relies on introns which are sections of DNA
that dont code for proteins and can therefore be different
without affecting the person
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