#Question id: 7287
#Unit 5. Developmental Biology
Following
statements are regarding to the the floral quartet model and the underlying
ABCDE model of organ identity determination in Arabidopsis thaliana.
A.
Five floral organ identities (sepals, petals, stamens, carpels, and ovules) are
specified by the formation of floral organ-specific tetrameric complexes of
MADS-domain transcription factors that bind to two nearby enhancer elements,
forming a DNA loop in between.
B.
A complex of two class A proteins (APETALA 1) and two class E proteins (SEPALLATA) determines petal identity.
C.
A complex of one class A protein, one class E protein, and one of each of the
class B proteins (APETALA 3 and PISTILLATA) determines sepal identity.
D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.
E.
A complex of one class E protein, one class C protein, and one of each of the
class D proteins (SHATTERPROOF and SEEDSTICK) controls ovule identity.
Which of the following combination are correct?
#Question id: 6942
#Unit 5. Developmental Biology
How long does embryonic development (before 1st instar larva hatches) take in this organism?
#Question id: 6943
#Unit 5. Developmental Biology
The portion of the blastoderm-stage embryo which will give rise to most ectodermal, mesodermal, and endodermal tissues is called the:
#Question id: 6944
#Unit 5. Developmental Biology
Which would lead to a dorsalized embryo? (Recall that genes in Drosophila are named for their mutant phenotype.
#Question id: 6945
#Unit 5. Developmental Biology
The portion of the Drosophila body plan which will produce the wing is called
#Question id: 6946
#Unit 5. Developmental Biology
The adult body plan of the fly is based on reiterating structures called segments; segment precursors (parasegments) are first positioned at the cell-by-cell level by which group of genes?