A woman heterozygous for color blindness (an Xlinked
recessive allele) marries a man with normal
color vision. What is the probability that their first
child will be color blind?
a. 25%
b. 50%
c. 75%
d. 100%
e. none of these
Answer: a
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__________________ Indicate whether the statement is true or false.
Which of the following is NOT involved in mineral uptake by plant roots?
A. root nodules that fix atmospheric nitrogen B. expending energy in uptake/active transport C. root hairs that increase surface area D. cuticles that protect surfaces
If meiosis did NOT occur in sexually reproducing organisms
A) the chromosome number would double in each generation. B) growth of the zygote would be halted. C) eggs would be haploid, but sperm would be diploid. D) mitosis would be sufficient. E) gametes would be haploid.
The carbon cycle is based on carbon dioxide. CO2 makes up about
A. 3% of the atmosphere. B. 0.03% of the atmosphere. C. 0.3% of the atmosphere. D. 0.003% of the atmosphere. E. 30% of the atmosphere.