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TLS Online TPP Program

#Question id: 7134

What important lesson for the mechanisms of development can we derive from the ability to clone frogs by nuclear transfer?

#Unit 5. Developmental Biology
  1. that the selective gene expression seen in differentiated cells does not result from an irreversible loss of genes, or their potential for expression
  2. that a piece of a frog can be "planted" to obtain a new, cloned individual, just like in plants
  3. that the pattern of gene expression in a differentiated cell can only be reversed if the nucleus is removed from the cell
  4. that the mechanisms of development are irreversible in all organisms except frogs
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TLS Online TPP Program

#Question id: 4736

#Unit 8. Inheritance Biology

A snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals, and all the F1 had white petals. The F1 was selfed. Among the F2, three phenotypes were observed in the following numbers

white                              240

solid-purple                    61

spotted-purple                19

Total                              320

Which of the following reason to deviation f2 phenotype ratio ?
TLS Online TPP Program

#Question id: 10454

#Unit 6. System Physiology – Plant

Arabidopsis mutants impaired in the chloroplast avoidance response with the help of PHOT1/PHOT2 led to the identification of a novel F-actin-binding protein known as
TLS Online TPP Program

#Question id: 5633

#Unit 5. Developmental Biology

During slow block to polyspermy, the components of the cortical granules bind to the _______ to form a fertilization envelope.
TLS Online TPP Program

#Question id: 28660

#Unit 2. Cellular Organization

cohesins associate with chromosomes by cohesin loading factors, which is?
TLS Online TPP Program

#Question id: 29068

#Unit 10. Ecological Principles

A positive correlation between population density over time and individual fitness is known as___