Describe the differences between heterochromatin and euchromatin in chromosomes. Are there any situations in which one can be changed into the other?
What will be an ideal response?
Euchromatin contains actively transcribed genes and undergoes normal cycles of condensation and decondensation in the cell cycle. Heterochromatin remains condensed and contains genes that are usually transcriptionally inactive. Euchromatin can be inactivated, as in the case of Barr bodies. It is then known as facultative heterochromatin.
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The designation his- refers to
A. the genotype of a bacterium that lacks a functional gene for histidine synthesis. B. the genotype of a bacterium that has a functional gene for histidine synthesis. C. the opposite of a hers gene. D. bacteria that are auxotrophic for histidine. E. the genotype of a bacterium that lacks a functional gene for histidine synthesis AND bacteria that are auxotrophic for histidine.
In which kingdom do jellyfish belong?
What will be an ideal response?
Genetic variation in bacterial populations cannot result from
A.) mutation. B.) transduction. C.) meiosis. D.) conjugation. E.) transformation.
The key specializations that occurred in the evolution of mammals include all of the following except
A. reduction in brain size. B. warm-bloodedness. C. digestive tract specialization. D. the presence of a placenta in most. E. different teeth suited to their diet.