Biology, 18.08.2019 05:20 osnielabreu
Ochre and amber are two types of nonsense mutations. before the genetic code was worked out, sydney brenner, anthony o. stretton, and samuel kaplan applied different types of mutagens to bacteriophages in an attempt to determine the bases present in the codons responsible for amber and ochre mutations. they knew that ochre and amber mutants were suppressed by different types of mutations, demonstrating that each is a different termination codon. they obtained the results. a single‑base substitution could convert an ochre mutation into an amber mutation. hydroxylamine induced both ochre and amber mutations from wild‑type phages. 2‑aminopurine caused ochre to mutate to amber. hydroxylamine did not cause ochre to mutate to amber. these data do not allow the complete nucleotide sequence of the amber and ochre codons to be worked out, but they do provide information about the bases found in the nonsense mutations. what conclusion about the bases in the codons of amber and ochre mutations can be made from these observations
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Biology, 22.06.2019 14:10, heroicblad
What do we call the process when two dominant alleles are expressed and do not blend? a. incomplete dominance b. codominance c. multiple alleles
Answers: 2
Biology, 22.06.2019 19:20, chikooo
3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?
Answers: 2
Ochre and amber are two types of nonsense mutations. before the genetic code was worked out, sydney...
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