What are two main reasons why DNA mutations are so rare?
What will be an ideal response?
ANSWER: DNA polymerase has a proofreading activity; it is able to correct mistakes it makes during
the replication process. Any mismatches missed by DNA proofreading can be fixed by DNA
repair mechanisms, such as mismatch repair.
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The genotypes and numbers of progeny resulting from a testcross are as follows: t+g+ l+ 72 tgl 69 t+gl 21 tg+l+ 18 t+gl+ 9 tg+l 8 t+g+l 2 tgl+ 1 Total 200 Calculate the genetic distance between genes g and l
What will be an ideal response?
Refer to Figure 37-4. Which of the fruits listed would be classified as an accessory fruit?
a. a
b. b
c. e
d. i
e. k
The first shell in any atom contains one orbital which may contain as many as:
A. 8 protons B. 4 neutrons C. 8 electrons D. 2 neutrons E. 2 electrons
All of the abiotic conditions under which a species can survive when adverse biotic conditions are absent is known as its
A. resource partition. B. habitat. C. realized niche. D. fundamental niche.