L20

Question 1

Leaf
___________ cell fate

Answer 1

Determinate

Question 2

Meristem
___________ cell fate

Answer 2

indeterminate

Question 3

leaf development steps (4)

Answer 3

1. Emergence
   leaf primordium
2. Establishing
   Adaxial-abaxial patterning
3. Blade outgrowth
4. Tissue differentiation

Question 4

adoxial =

Answer 4

upper side of leaf

Question 5

abaxial =

Answer 5

lower side of leaf

Question 6

In leaf primordia,_____ can act as transcriptional repressors to shut off KNOX-1 genes

Answer 6

ARPs

Question 7

How does a leaf know which side is adaxial (or abaxial) ?

Answer 7

A signal from the meristem moves through the epidermis into the incipient primordium.

The signal conveys the adaxial positional information.

The nature of the signal is not known.

Question 8

Adaxial genes

Answer 8

HD ZIP genes (REVOLUTA
PHABULOSA)

Question 9

Abaxial genes

Answer 9

YABBY
KANADI
miR165/6

Question 10

In wild-type plants, PHB expression is restricted to the____ side of the leaves

Answer 10

adaxial

Question 11

In gain-of-function phb-1d mutants, PHB is expressed________, resulting in adaxialized, radially symmetric leaves.

Answer 11

everywhere

Question 12

Leaf polarity requires proper expression of_____

Answer 12

PHB, YAB, KAN