The Y chromosome
A) forms the somatic cells.
B) is a sex chromosome.
C) contains discontinuous DNA sequence.
D) is present in all humans.
B) is a sex chromosome.
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Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This ratio suggests that _____
A) the parents were true-breeding for contrasting traits B) the particular trait shows incomplete dominance C) a blending of traits has occurred D) the parents were both heterozygous for the particular trait E) each offspring has the same alleles for each of two different traits
Loss of tumor suppression in a cell usually results from
A) a translocation of a tumor suppressor gene. B) an inversion involving a tumor suppressor gene. C) a deletion of a tumor suppressor gene. D) activation of a proto-oncogene by a virus.
Where do you expect to find thermophiles?
A. In environments lacking oxygen B. In hot environments C. In salty environments D. In dry environments
Artificial selection has been used to shape the behavior of farm animals such as the chicken and domestic animals such as the dog
Evolutionary behaviorists believe that natural selection has also affected the appearance and behavior of the domestic dog. Provide a short explanation of how this may have happened. What will be an ideal response?