Monterey cypress trees grow along the coast of California with most of their branches clustered on one side of the tree, pointing away from the sea. If a monterey cypress seed is germinated more than 50 miles inland, the tree grows up with a symmetric distribution of branches, just like other evergreens. This scenario demonstrates which statement about genetics?
a. The windblown shape seen in coastal trees is obviously caused by polygenic inheritance.
b. The windblown shape seen in coastal trees is obviously determined by their genotypes.
c. The windblown shape seen in coastal trees is a result of environmental conditions, not their genes.
d. Both the first and second choices are true.
e. None of the above.
Ans: c. The windblown shape seen in coastal trees is a result of environmental conditions, not their genes.
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Mendel crossed true-breeding plants that had yellow peas with plants that had green peas. The resulting plants all had yellow peas. An F1 cross resulted in three-quarters of the plants having yellow peas and one-quarter of the plants having green peas. What does this tell you about the alleles for colour?
a. Green was the dominant colour. b. Yellow was the recessive colour. c. Yellow was the dominant colour. d. Yellow was usually th
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Fill in the blank(s) with the appropriate word(s).
Cell junctions in plant cells are called __________, and communicating junctions in animal cells are called __________.
Fill in the blank(s) with the appropriate word(s)