week 3 : DNA Fingerprinting

The chemical structure of every one's DNA is the same, the only difference is the sequence.

Everyone could be identified because in the sequences there base pairs. Because there are so many base pairs it would take a very long time - so scientists can use a shorter method by repeating the DNA patterns, this is called DNA fingerprinting.

These patterns do not give an individual fingerprint, but they are able to tell whether two DNA samples are from the same person, related people, or non-related people.

The only problems with DNA fingerprinting are: it is hard to identify specific people, the scientists have to make sure they know who's print it is especially in criminal cases.

week 2 : Blood types

A blood type is also called a blood group. There are 4 blood groups A, B, AB, O. The tabe below shows the type of red blood cell, the anti-bodies and the antigens present in each blood type.

This shows the antigens

The pie chart below shows Blood Type Percentages

Each of these 4 groups can be either Rhesus positive or Rhesus negative.

week 1 : Fingerprints

There are different types of patterns in fingerprints, they are: loop, twinned loop, central pocket loop, lateral pocket loop, whorl, arch, tented arch, composite, accidental.

Loop

Twinned Loop

Central Pocket Loop

Lateral Pocket Loop

Whorl

Arch

Tented Arch

Composite

Accidental