Following statements regarding to the embryogenesis in A. thaliana.

A. The first zygotic division is unequal, with the basal cell larger than the apical cell. The basal cell divides to give rise to the suspensor. The apical cell divides vertically to form a two-celled proembryo, which will give rise to the rest of the embryo.

B. The top most suspensor cell is recruited into the embryo, where it is known as the hypophysis, and contributes to the embryonic root meristem and root cap.

C. The next two divisions produce an eight-cell octant-stage embryo, which develops into a heart-stage embryo of around 32 cells

D. The embryo elongates and the cotyledons start to develop as wing-like structures at one end, while an embryonic root forms at the other. This stage is known as the globular stage.

Which of the following statements are correct?

#Question id: 4700

#Unit 9. Evolution & Diversity of Life Forms

Which of the following is not an observation or inference on which natural selection is based?

#Question id: 4701

#Unit 9. Evolution & Diversity of Life Forms

Charles Darwin discussed all of the following EXCEPT:

#Question id: 4702

#Unit 9. Evolution & Diversity of Life Forms

Which of the following is correct match?

#Question id: 4703

#Unit 9. Evolution & Diversity of Life Forms

Within a few weeks of treatment with the drug 3TC, a patientʹs HIV population consists entirely of 3TC-resistant viruses. How can this result best be explained?

#Question id: 4704

#Unit 9. Evolution & Diversity of Life Forms

About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction?

#Question id: 4705

#Unit 9. Evolution & Diversity of Life Forms

Darwin and Wallace's theory of evolution by natural selection was revolutionary because it ________.