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6. What is a homologous structure?
- When different species have similar structures due to them being adapted to similar environments.
- An organ or a bone that appers in different organism that demonstrate that they share a common ancestor.
- When organisms share similar characterisitcs due to them have a common ancestor.
- Feautures that evolve in different organisms that have the same function.
7. Name two human characteristics with variation that caused solely by the environment
- lobed or lobedless ear.
- ear piercing and tatoo.
- Eye colour and blood group.
- Skin colour and height.
8. Name two human characteristics with variation caused solely by genetics.
- Height and mass.
- Eye colour and blood group.
- Hair colour and texture.
9. Define a species
- A group of similar organisms that can interbreed to produce infertile offprings.
- A group of similar organisms that can interbreed to produce fertile offsprings.
- A group of different organisms that can interbreed to produce fertile offsprings.
10. How does genetic variation arise within a species?
- Independent assortment and crossing over of DNA during meiosis, Mutations, Alleles .
- Mitosis, Mutations and independent assortment.
11. List the taxonomical groups in order
- Kingdom Phylum Class Order Genus Family and Species.
- Kingdom Phylum Class Order Family Genus and Species.
- Class Phylum Kingdom Genus Species Order and Family.
12. Define a Hybrid
- When organism from different species interbreed to produce an infertile offspring.
- When organisms from the same species interbreed to produce an infertile offspring.
- When 2 organisms form different species interbreed to prouce a fertile offspring.
13. A harmless snake mimicks the colours of a venomous snake. What type of adaptation is this?
- Anatomical
- Biochemical
- Physiological
- Behavioural
14. Why are Hybrid's infertile?
- The sperm cannot reach the egg.
- The foetus fails to develop after fertiliisation.
- They contain an odd number of chromosomes.
- They are sexually incompatible.
15. State 3 types of evidence for evolution
- Fossil records, Biochemistry and comparing anatomy.
- DNA Analysis, Physiology and base sequence.
- codons, amino acids and fossil records.