In meiosis, X and Y chromosomes will pair as homologous chromosomes, but they will recombine only in a few limited regions, at the ends. Explain why recombination is limited in this situation
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The X and Y chromosomes contain different genes. In most places, they do not have identical regions to exchange.
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Species that determine the structure of communities are called
a. climax. b. keystone. c. transitional. d. crucial. e. pioneer.
Which of the following is characteristic of hypothyroidism?
a. Grave’s disease b. elevated heart rate c. thyroid stimulating antibodies d. intolerant to cold temperatures e. heavy sweating
Suppose that an F1 dihybrid cross results in a phenotypic ratio of 9:3:4. What does this tell you?
a. The second locus is dominant over the first locus. b. Dominance is incomplete at the second locus. c. Epistasis is occurring. d. Codominance is at the second locus.
Many polar-dwelling fishes have "antifreeze proteins" that prevent their bodies from freezing solid
even at very low temperatures. Briefly describe how these proteins function.
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