Epigenetics involves changes in the expression of a gene or set of genes by _______ and/or _______.
A: transcription factors; DNA methylation
B: chromosomal protein alteration; transcription factors
C: promoters; chromosomal protein alteration
D: DNA methylation; chromosomal protein alteration
E: promoters; DNA methylation
Answer: D: DNA methylation; chromosomal protein alteration
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Why did Mendel perform reciprocal crosses?
A) To obtain enough plants to perform the experiments that Mendel wanted. B) To test a hypothesis that stated the ovum carries all the information for progeny. C) To be able to breed plants year round. D) To determine whether the inheritance of a trait depends on which parent carries the trait.
What happens during the process of gene flow in a population?
a. DNA of organisms in a population is randomly changed through mutation b. the allele frequencies vary between generations due to migration c. allele frequency slowly shifts towards the dominant alleles in the population d. allele frequencies randomly change from random mating through the generations
The best target for drug development would be
A. genes that are shared by humans and the organisms causing Chagas disease, African sleeping sickness, and Leishmania. B. genes that are shared by humans and the organisms causing Chagas disease but not the organisms causing African sleeping sickness or Leishmania. C. genes that are shared by the organisms causing Chagas disease, African sleeping sickness, and Leishmania but not shared by humans. D. genes that are shared by the organisms causing Chagas disease and African sleeping sickness but not shared by humans or the organisms causing Leishmania.
The ________ are muscles of the rib cage that contract and therefore increase the size of the thoracic cavity during inhalation
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