1. Writing reasons why some survived and others did
not.
Why did were some eggs easily found and others
not?
Which eggs would be most likely to live on?
Why, where, how?
Is an Evolution of the eggs needed?
Think about colour, location, shape, size,
environment, predators (you) access,

2. Write or draw an example of another
situation where genes affect survival.
Explain why, influences, result.
Natural Selection
Individuals with these particular characteristics are
said to be better adapted to the environment.
Individuals with unfavourable characteristics will
usually die before they are able to reproduce.

3. Revision

4. DNA (Deoxyribonucleic acid) Review
 A karyotype is the number and appearance
of chromosomes in the nucleus.
 It is the complete set of chromosomes in a
species, or an individual organism.
 A chromosome is an organized structure of
coiled DNA and protein found in cells.

5. DNA Review
 DNA Constructed of Rungs & Rails’
 Rungs are a pair of bases
 A (Adenine) is paired with T (Thymine)
 G (Guanine) is paired with C (Cytosine)
 DNA is a BLUEPRINT of how to build the
body.
 It stores/determines the biological
characteristics of any living thing

6. Cell replication
 The body grows and repairs itself through cell
division.
 A parent cell divides into 2 daughter cells
 A process know as mitosis for normal cells
 DNA is replicated and separated into 2 cells
so all the Blueprints/information is there.
 1 Parent cell forms 2 Identical Daughter cells

7. Genes
 Genes are passed on through DNA.
 A long long strand of DNA twisted and
twisted form a chromosome
 How many Chromosomes do we have?
 46, 23 pairs.
 What can occur if cells have an extra
chromosome?

8. Dominance and recessive gene
A DOMINANCE allele covers up the
recessive form.
A DOMINANCE allele is
represented in CAPITALS
A recessive allele is represented in
lower case

9. Phenotypes and genotypes
Phenotype – is the physical
characteristic of the gene
ie attached lobe
Genotype is the combination of
alleles (genes) that make up the gene
– represented in letters.
LL, Ll (lL), ll

10. Phenotype – is the physical
characteristic/appearance of the
gene ie attached lobe
Genotype is the combination of
alleles (genes) that make up the gene
– represented in letters.
LL, Ll (lL), ll

11. Question time
 Two black fish look the same but have
different genotypes. The fish with genotype
BB is said to be homozygous, or pure
breeder because both the alleles for the
skin colour gene are the same. The other
fish is said to be heterozygous or Hybrid,
because its two alleles for skin colour gene
are different.
What offspring can occur when the fish
cross breed, that is BB & Bb.
What offspring can occur when 2
heterozygous breed?

12. Incomplete Dominance
Incomplete dominance is a condition when neither
allele inherited is dominant or recessive over the
other
This will result in a blend/fusion of characteristics
An example of this is in snapdragons, a flower where
its colour can be red, pink, or white.
 A white (WW) snapdragon crossed with a red (RR)
snapdragon produces all pink offspring
 The heterozygous (RW) condition results in pink
flowers.

14. Codominance
When both alleles contribute to
the phenotype of an organism
Ex.) Speckled Chickens

15. Human Blood Types
Phenotype Genotype
A IAIA or IAi
B IBIB or IBi
AB IA I B
O ii

16. Genetics and the Environment
 The characteristics of any organism, is
not only determined by the genes it
inherits
 Characteristics are determined by
interactions between genes and the
environment
 Ex.) genes may affect a plants height
but the same characteristic is
influenced by climate, soil conditions
and availability of water

17. Genetics and the Environment –
Evolution
 The best adapted organisms are those
that survive environmental changes
and pass on favourable characteristics
to their offspring
 2 colour types of Frogs in the world.
Green and earth.
 Which frog would be more likely to be
found in the outback? Why?
 Which frog would be existiant in the
forest? Why?

18. Genetics and the Environment –
Evolution
 2 colour types of Frogs in the world.
Green and earth.
 Which frog would be more likely to be
found in the outback? Why?
 Which frog would be existiant in the
forest? Why?
 If all the forests died which frog would
survive? Why?

19. Genetics and the Environment –
Evolution
 The Movie 300.
 Is this a form of Evolution or Selecting
genes?
 Would this lead a form of evolution?

20. Finished

21. Red hair is a recessive gene and Brown hair is a
dominate gene.
If your parents both have Brown hair is it
possible for you to have red hair?
Answer yes or no.
Give Reasoning as to why and show diagram of
how this can occur.
Show one example of how it will not be
possible for you to have red hair.