Biology, 29.08.2019 20:00 cyaransteenberg
Gene s controls the sharpness of spines in a type of cactus. cactuses with the dominant allele, s, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. at the same time, a second gene, n, determines whether or not cactuses have spines. homozygous recessive nn cactuses have no spines at all.
if doubly heterozygous ssnn cactuses were allowed to self-pollinate, the f2 would segregate in which of the following ratios?
a) 3 sharp-spined: 1 spineless
b) 1 sharp-spined: 2 dull-spined: 1 spineless
c) 1 sharp-spined: 1 dull-spined: 1 spineless
d) 1 sharp-spined: 1 dull-spined
e) 9 sharp-spined: 3 dull-spined: 4 spineless
Answers: 1
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Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation
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Gene s controls the sharpness of spines in a type of cactus. cactuses with the dominant allele, s, h...
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