AD4

Question 1

What are similarities and differences between organisms a result of?

Answer 1

Similarities: Having a common ancestor
Differences: Result of natural selection adapting them to different environments

Question 2

What is an example of a cue that predicts future conditions?

Answer 2

The temperature butterfly pupa form in affects the wing colouration- different for the wet and dry season

Question 3

What is an example of a cue that determines normal development?

Answer 3

In some insects a blood meal stimulates the production of vitellogein which is a necessary component of eggs

Question 4

What is an example of changes in spatial expression in birds?

Answer 4

• BMP4 protien instructs cells to destroy webs
• BMP inhibitor in ducks stops cell death
• Therefore giving them webbed feet

Question 5

What is an example of a mutation in insects causing morphological change?

Answer 5

Ubx mutated gene represses the dll gene in the abdomen which is essential for leg formation- therefore insects don’t have legs on their abdomens

Question 6

What 3 things can morphological changes result from?

Answer 6

1) Mutations in genes which regulate development
2) Changes in spatial expression of developmental genes
3) Changes in temporal expression of developmental genes

Question 7

What set of genes provide anterior and posterior information in both mammal and insect embryos?

Answer 7

Hox genes

Question 8

What is Evo-devo?

Answer 8

Genetics and embryology