Exam

Question 0

What did Walter Sutton discover?

Answer 0

After experimenting with grasshopper testes, he discovered that gametes only contain half the number of chromosomes of somatic cells, and that upon fertilisation the number is restored. Suggesting that mendles factors of inheritance were carried on chromosomes.

Question 1

What did Theodora boveri discover and how does this connect to hereditary.

Answer 1

Boveri discovered that after experimenting with sea urchins that the nucleus of an egg and sperm each contribute 50% of the chromosomes to the zygote- making a connection between hereditary and chromosomes.

Question 2

Evidence that lead to Tatum and Beadles one gene-one polypeptide theory.

Answer 2

Beamed X-rays at NEUROSPORA CRASSA.
The neurosporra crassa no longer produced the enzyme which broke down vitamins into amino acids and subsequently died.
This led to the theory.

Question 3

Thomas hunt Morgan - work with sex linked inheritance

Answer 3

Looked at crosses between the DROSPHILA MELANOGASTER (red and white eyed) –> ratios could not be accounted for with mendles ratios. His work showed that gender/ some genes are carried on the sex chromosomes.

Question 4

Examples of how evolution is supported by: palentology

Answer 4

The deeper the fossil, the older the organism

Fossil records can show missing links.
Reptiles to birds -archaeopteryx

Question 5

Examples of how evolution is supported by: biogeography

Answer 5

Continental drift.

The locations of ratides (flightless birds) suggests they originated from a common ancestor

Question 6

Examples of how evolution is supported by: comparative anatomy

Answer 6

Homologous structures: limb with same basic plan but slight mods

Pentdactyl limb –> all vertebrae
Vestigial organs –> appenxix & coccyx