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TLS Online TPP Program

#Question id: 4714

After the drought of 1977, researchers hypothesized that on the Galápagos Island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of these events is now most likely to occur to finch beaks on this island?

#Unit 11. Evolution and Behavior

  1. evolution of yet larger, deeper beaks over time, until all birds have relatively large, deep beaks

  2. evolution of smaller, pointier beaks over time, until all birds have relatively small, pointy beaks

  3. increased variation in beak size and shape over time

  4. no change in beak size and shape over time

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TLS Online TPP Program

#Question id: 28323

#Unit 5. Developmental Biology

 A cleavage furrow cleaved only a portion of the cytoplasm and does not penetrate the yolky portion, this type of cleavage is referred to as___ 
TLS Online TPP Program

#Question id: 28324

#Unit 5. Developmental Biology

Echinoderms exhibit which type of cleavage?
TLS Online TPP Program

#Question id: 28325

#Unit 5. Developmental Biology

The pattern of embryonic cleavage peculiar to a species is determined by two major parameters: 
(1) the amount and distribution of yolk protein within the cytoplasm, which determine where cleavage can occur and the relative sizes of the blastomeres
(2) factors in the egg cytoplasm that influence the angle of the mitotic spindle and the timing of its formation

Which of the following statements is incorrect about patterning of embryonic cleavage?
TLS Online TPP Program

#Question id: 28326

#Unit 5. Developmental Biology

Infolding of a sheet of epithelium cells which are mainly seen in the sea urchin endoderm ?
TLS Online TPP Program

#Question id: 28327

#Unit 5. Developmental Biology

During the formation of Amphibian mesoderm, Inward movement of an expanding outer layer so that it spreads over the internal surface of the remaining external cells, this process of movement of outer layer is called as____
TLS Online TPP Program

#Question id: 28328

#Unit 5. Developmental Biology

Ingression process involved migration of individual cells from the surface into the embryo's interior, this process is found in_____