If mutagenizing a number of Drosophila results in several observable phenotypes but also in several lethal mutations, does this mean that recessive lethal mutations cannot be studied further?
A) No—the lethal allele can be recovered from heterozygous siblings.
B) No—the lethal allele can be sequenced from the other embryos.
C) Yes—lethal alleles can be studied only if they are recessive.
D) Yes—lethal alleles can be studied only if they are conditional.
E) Yes—unless the lethal allele can be supplemented with a missing gene product.
A
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Answer the following statements true (T) or false (F)
1. In an open circulatory system, there is no difference between blood and interstitial fluid. 2. Relative to closed circulatory systems, Open Circulatory Systems pump hemolymph at relatively high pressure. 3. Blood is typically delivered to respiratory structures at low pressures in closed circulatory systems. 4. Frogs have two atria, but only a single ventricle.
An insufficient number of particular types of cones causes
A) impaired night vision. B) macular degeneration. C) detachment of the retina. D) impaired color vision. E) glaucoma.
How many strands does RNA have ?
A. Triple B. Double C. Single D. Both single and double
Which is the normal start codon for protein synthesis?
a. AUG b. UAA c. UAG d. UGA e. GGU