Chapter 9

Question 1

the rearrangement of cells of a tissue that cause it to become narrower and longer

Answer 1

convergent extension

Question 2

are diagrams showing organs and other structures that arise from each region of an embryo

Answer 2

fate maps

Question 3

are the specialized cells that give rise to
sperm or eggs

Answer 3

germ cells

Question 4

One limb bud–regulating region is the

Answer 4

apical ectodermal ridge (AER)

Question 5

play roles in normal kidney development

Answer 5

monocilia

Question 6

can develop into all the possible cell types

Answer 6

totipotent

Question 7

The molecular cues that control pattern formation are called

Answer 7

positional information

Question 8

programmed cell death

Answer 8

apoptosis

Question 9

performed experiments to determine a cell’s developmental potential (range of structures to which it can give rise)

Answer 9

hans spemann

Question 10

act as cytoplasmic determinants, fixing germ cell fate at the earliest stage of development

Answer 10

p granules

Question 11

is mesodermal tissue under the ectoderm where the posterior side of the bud is attached to the body

Answer 11

zome of polarizing activity (ZPA)

Question 12

is the term used to describe the process by which a cell or group of cells becomes committed to a particular fate

Answer 12

determination

Question 13

is an inductive signal for limb development

Answer 13

sonic hedgehog

Question 14

also play roles during limb pattern formation

Answer 14

hox genes

Question 15

refers to the resulting specialization in structure and function

Answer 15

differentiation