Plant and animal food sources have been improved by ____________________ for thousands of years
Fill in the blank(s) with correct word
artificial selection
selective breeding
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Explain the circumstances that led to a debate about whether all inheritance cases could be explained by Mendelian inheritance or whether there might be another, separate mechanism of inheritance that did not follow the laws of segregation and independent assortment. Summarize the outcome of that debate
What will be an ideal response?
Which statement is true?
a. Only diploid plant stages are free-living. b. All spores are clones of their parent cells. c. Most plant and fungi spores are haploid. d. Gametophytes are larger than sporophytes.
In the late 1870s, Charles Darwin and his son, Francis, discovered that if the tip of the grass was covered, phototropism did not occur, even though the rest of the grass was exposed to light. However, if the rest of the plant was covered and only the tip exposed to light, the grass bent a few centimeters below the tip. Which of the following was sensing the light?
A. auxin-detecting cells in the tip of the grass B. auxin-producing cells in the tip of the grass C. auxin-producing cells a few centimeters below the tip of the grass D. auxin-detecting cells a few centimeters below the tip of the grass
If an X-linked recessive trait has a frequency of 5% in males, what percentage of females are carriers? (Assume that the population is in Hardy-Weinberg equilibrium.)
A) 9.5% B) 5% C) 95% D) 4.2% E) 10%