What does the fossil record tell us?
What will be an ideal response?
It shows that there has been progressive change with time, with the oldest fossils having the simplest structures and organisms becoming more complex through time. This is solid evidence for evolution.
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Which of the following is involved in B cell selection and tolerance?
A) clonal anergy B) clonal deletion C) clonal anergy and deletion D) allelic exclusion
What can you conclude from these data?
Consider the pathway for the synthesis of the amino acid arginine in Neurospora:
Mutant strains of Neurospora may carry one or more mutations. Neurospora mutant strain b is grown on minimal media plus supplements as shown. Growth is shown by (+) and no growth is shown by (o).
A) Strain a has only one mutation and it is in ARG-E.
B) Strain b has only one mutation and it is in ARG-H.
C) Strain a has a mutation in ARG-F and strain b has a mutation in ARG-E.
D) Strain b has mutations in ARG-E, ARG-F, and ARG-H.
Earth has a constant tilt of _____ on its axis from its plane of orbit.
A. 5.5° B. 9° C. 12.5° D. 23.5° E. 30°
An X-linked carrier is a
a. homozygous dominant female. b. heterozygous female. c. homozygous recessive female. d. homozygous male. e. heterozygous male.