How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes? What will be an ideal response?
In most chromosomes, crossing-over is a way to make sure that subtle changes are regularly
exchanged and that major differences do not accumulate. In the X and Y chromosomes, the slow
accumulation of a region in which crossing-over did not occur prevented genetic exchange between the
two and resulted in each evolving differently. It is very similar to taking a population and separating it
- each will accumulate its own unique mutations and these will slowly create a significant difference
between the two.
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Cells must efficiently transfer energy from their energy-trapping systems to the systems actually carrying out work and also use various metabolic processes to replace the energy used in doing work. This is called the ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following does not occur in photosynthesis?
a. reduction of CO2 b. reduction of oxygen c. oxidation of water d. All of these are correct.
Select the postzygotic isolating mechanisms. (Check all that apply).A) Hybrids are sterile.B) Hybrids develop abnormally.C) Hybrids fail to become established in nature.D) Hybrids cannot be formed.
What will be an ideal response?
_____ Manual of Systematic Bacteriology is a manual of bacterial descriptions and classifications.
A. Pasteur's B. Lister's C. Bergey's D. Leeuwenhoek's E. Koch's