genetics. inheritable and non-inheritable characteristics some characteristics are passed on from...
TRANSCRIPT
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Genetics
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Inheritable and Non-inheritable characteristics
some characteristics are passed on from parents to children – these are called inheritable…
these characteristics may in turn be passed on to the following generation(s)…
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Inheritable and Non-inheritable characteristics
other characteristics are independent of parentage – these are called non-inheritable…
these characteristics will not be passed on to the following generation(s)…we hope!
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Inheritable characteristics are received from parents…
father mother
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Check out some of your own inheritable characteristics…
Arm fold preference “Hitchhiker’s thumb” Pinkie finger alignment Ear lobe attachment
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Check out your own…Arm fold preference: fold your
arms - Do you fold right-over-left or left-over-right?
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Check out your own“Hitchhiker’s thumb”: extend your
thumb – ? Is it straight or curved?
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Check out your own … Pinkie fingers: place them side by side –
? Are they straight or curved away from each other?
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Check out own … Ear lobes: look at your ear in a
mirror – ? Is it directly attached or
separated ?
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Other inheritable characteristics include:
eye colour freckles
blood type
haemophilia
cystic fibrosis
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Some non-inheritable characteristics:
Athletic ability Artistic ability Accent
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For each inheritable characteristic, a human has two genes – one passed on by the father’s sperm cell, the other by the mother’s egg cell
one gene for eye colour
one gene for eye colour
two genes for
eye colour
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CELL Nucleus
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©news.bbc.co.uk
These are Chromosomes the genes are on the chromosomes
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© 2005 Chugoku Rosai Hospital
• DNA is what makes a chromosome• A part of the DNA that controls a
characteristic is called a GENES• The gene is the code for any one inherited
character – e.g. eye colour
Genetics
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© 2005 Chugoku Rosai Hospital
• the long DNA molecule is so twisted and coiled so that it takes up tiny little space…A Double Helix
• each twisted coil of DNA, containing many genes, makes one chromosome…
• small molecules of protein help keep the chromosome in shape
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• DNA stands for deoxyribonucleic acid
• It is twisted into a double helix and contains all the codes to build a body
• the code contains instructions for every structure and function the body will ever need
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Four Amino Acids in DNA
• Cytosine • Guanine• Thiamine• Adenine
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• the code in DNA is different in every human being…(except for ?????)
• Each individual’s unique code is called their DNA fingerprint
• because of this, DNA is used in
• crime scene investigation
• parental disputes
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Solved with DNA.
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• the code in DNA is different in every human being…except for ?????
IDENTICAL TWINScan you explain why
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Summary
• DNA• Inheritance• Gene• Chromosome
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H/W
• P89• Q 5-8