Fragile X syndrome is caused by ____ on the X chromosome in humans
a. the presence of CCG repeats
b. mutations within CCG repeats
c. deletion of CCG repeats
d. overreplication of CCG repeats
e. the absence of CCG repeats
D
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Lake ecosystems have many trophic levels
Indicate whether the statement is true or false.
. Four of the five answers listed below are
relationships in which at least one of the interactants benefits. Select the EXCEPTION.
a. competition b. parasitism c. mutualism d. commensalism e. predation
Which plant is the most fit?
A) a plant with deep roots B) a plant with large leaves C) a plant with large flowers D) Environmental information is required to determine fitness.
In fragile X syndrome, the fragile X gene contains a nucleotide triplet that repeats 200-1000 times. Indicate whether the statement is true or false