23 Genes and Development

Question 1

dentricles

Answer 1

larval segments identified by the distribution of cuticular hairs

Question 2

how do mRNAs from nurse cells know how to move

Answer 2

via microtubules

Question 3

distribution of bicoid mRNA in egg

Answer 3

anterior

Question 4

distribution of nanos mRNA in egg

Answer 4

posterior

Question 5

mutations in bicoid and nanos

Answer 5

result in larva existing in opposite end

Question 6

bicoid mutants have

Answer 6

two posterior ends

Question 7

mutations in maternaal effect genes do not

Answer 7

follow mendelian patterns of inheritance

Question 8

zygotic genes

Answer 8

genes that are transcribed after fertilization

Question 9

kruppel

Answer 9

“gap” genes

Question 10

maternal effect genes regulate

Answer 10

gap genes

Question 11

gap genes regulate

Answer 11

“pair rule” genes, hairy

Question 12

loss of hairy

Answer 12

deletion of alternate segments

Question 13

loss of kruppel

Answer 13

deletion of middl segments

Question 14

pair rule genes regulate

Answer 14

“segment polarity” genes like engrailed

Question 15

loss of engrailed causes

Answer 15

mirror of posterior

Question 16

hierarchy of gene regulation(5)

Answer 16

maternal effect
gap
pair-rule
segment polarity
proper segmentation

Question 17

HOX genes

Answer 17

code for transcription factors that are expressed in an anterior-posterior pattern

Question 18

HOX genes specify

Answer 18

identity of adult structures in particular segments

Question 19

mutations in the Hox gene bithorax cause

Answer 19

3rd thoracic segment to adopt 2nd thoracic segment

Question 20

combinatorial gene expression also

Answer 20

regulates plant developement

Question 21

Pax6. loss of function mutations

Answer 21

result in organisms with abnormal eye development

Question 22

why cant drosophilia produce a mouse eye and only a. fly eye

Answer 22

lack genes to do so

Question 23

lateral inhibition example

Answer 23

vulval cellls in C. elegans

Question 24

lateral inhibition

Answer 24

cells send. out signals to cells adjacent to prevent. differenciation

Question 25

delta/notch signaling

Answer 25

lateral inhibition