DNA sequences that contribute to polygenic traits are called
A) qualitative trait loci.
B) quantitative trait loci.
C) multifactorial trait loci.
D) single nucleotide polymorphisms.
B) quantitative trait loci.
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Four of the five answers listed below are true
for gibberellin. Select the EXCEPTION.
a. stimulates seed germination b. found in fungi c. causes stem elongation d. stimulates fruit ripening e. is a growth hormone
The phagocyte that kills about 20 bacteria before dying is the __________
a. eosinophils b. macrophage c. neutrophils d. dendritic cell e. basophils
Amish populations in Lancaster County, Pennsylvania have high rates of a rare form of dwarfism. The recessive allele that codes for this disorder is found in 1 of 14 individuals in this Amish population, in contrast to 1 in 1,000 in the general population. In Ohio, an Amish population suffers with higher than normal rates of cystic fibrosis and a host of other genetic diseases so rare that some have not yet been named. What factors have caused such severe genetic problems in these two communities?
What will be an ideal response?
Very rapid speciation occurred when cichlid fishes were isolated in Lake Victoria. Widespread extinction was dramatically seen when
A. hybridization stopped. B. insect larvae stocks were depleted. C. fishing was prohibited. D. predatory fish were added. E. artificial selection stopped.