Leys - Early Development

Question 1

The 4 essential processes needed to develop from a single cell into a multicellular organism are: _______, _______, _______, and _______

Answer 1

cell proliferation
cell specialization
cell interaction
cell movement

Question 2

How is cell determination tested?

Answer 2

a portion from one section (ex. foot) of a donor organism is placed into a different section (ex. arm) of a host organism; if the host grows and exhibits the phenotype of the original section (ex. has a foot where a arm should be), then the portion of cells that were transplanted were fated (determined) to be a foot before the transplant

Question 3

True or false: Very different organisms may have similarities in their developmental genes.

Answer 3

True. (ex. HOX genes)

Question 4

_______ genes direct regions (segments) to differentiate into their final forms.

Answer 4

homeotic

Question 5

Genes can have _______ expression patterns by having a series of _______ directing _______ in different regions of the organism.

Answer 5

complex
control regions
transcription

Question 6

_______ genes are arrayed on the chromosome in the same spatial order as they are expressed in _______ and in the same order in _______ and _______.

Answer 6

homeotic
developing embryos
fruit flies
humans