How is hybrid sterility overcome in allopolyploid plants?
What will be an ideal response?
Typically, allopolyploids are produced when two different species hybridize. The resulting offspring then contains one set of chromosomes from each parental species and is sterile because the sets are not homologous and cannot pair at meiosis to produce viable gametes. However, if both chromosome sets double by means of division error (nondisjunction), each diploid set can function normally during meiosis, and N1+N2 gametes will be produced. Fusion of two such gametes will produce an allotetraploid offspring.
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Which amino acid would Nirenberg and Leder have found when they used the triplet UAG?
A. Isoleucine B. Proline C. Lysine D. Threonine E. None of these
Simple diffusion is defined as the movement of
What will be an ideal response?
Why is meiosis important for sexual reproduction?
A. It allows the zygote formed from fertilization to have triple the chromosome number of the organism. B. It allows gametes to have twice the original number of chromosomes of the organism. C. It allows gametes to have half the original number of chromosomes of the organism. D. It allows the zygote formed from fertilization to have half the original number of chromosomes of the organism.
Gross primary productivity refers to the total ____.
A. quantity of solar energy available to the ecosystem in a given period of time B. quantity of solar energy reaching a given area of the ecosystem C. energy captured initially by the producers D. energy used by the heterotrophs of the ecosystem in a given period of time E. energy used by the producers for their growth and reproduction