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Biological Factors
Affecting Growth and
Development.
- Genetic
Inheritance.
- 23 pairs of chromosomes.
- Made of DNA which carries inheritence known as genes.
- DNA = Deoxyribonucleic acid
- DNA = Deoxyribonucleic acid
- Fathers donation of the Y chromosome in the
23rd pair which determines the sex of the child.
- Made of DNA which carries inheritence known as genes.
- 23 pairs of chromosomes.
- Chromosome Abnormalities.
- 1 in 200 babies born alive
has chromosome
abnormalities.
- Down's Syndrome - Trisomy 21.
- 1 in 650 babies are born with Trisomy 21.
- Trisomy 21 = Presence of 3
chromosomes at pair 21
- More present in women in their late 30's
and 40's
- Offered invaisive tests of sampling foetal cells
from the amniocentesis or chronic villus sampling.
- Offered invaisive tests of sampling foetal cells
from the amniocentesis or chronic villus sampling.
- Small facial features with eyes that slope
upwards at the outer corners.
- Skin folds covering the nasal corners.
- Tongue is large and protruding.
- Tongue is large and protruding.
- Hands are short and broad with unusual
palm creases.
- Back of head is flat.
- Back of head is flat.
- Skin folds covering the nasal corners.
- Less than a generation ago, many Down's
Syndrome children did not live past adolescence.
- 1 in 650 babies are born with Trisomy 21.
- 1 in 200 babies born alive
has chromosome
abnormalities.
- Unifactorial Disorders.
- Cause considerable disability.
- Divided into Autosomal Disorders and Sex-linked Disorders.
- Autosomal Disorders.
- 23 pairs of chromosomes.
- Composed of 2 units called alleles, each of
which is on a single chromosome.
- Each allele originate from
parent.
- 2 alternative forms.
- The gene could be composed of 2
alleles, BB bb or Bb.
- Each allele originate from
parent.
- Composed of 2 units called alleles, each of
which is on a single chromosome.
- 23 pairs of chromosomes.
- Sex-linked Disorders.
- Autosomal Disorders.
- Cause considerable disability.
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