Biology

Biology, 27.07.2019 12:30, alliehall2002

Nucleotide substitutions occur by mistake in a segment of ribosomal rna at a constant rate of one substitution every 10,000 years. a biologist has compared the ribosomal rna of two modern-day species and found that they have six differences in their sequences. how many years ago did these species diverge from a common ancestor?

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Biology, 02.08.2019 18:30, aishacobb

Aresearcher attempts to use a segment of ribosomal rna as a molecular clock to calculate the date of the last common ancestor of two species. he finds that the two species diverged from a common ancestor 150 million years ago. these particular species have abundant fossil records that strongly suggest that these species diverged 100 million years ago. which of the following answer choices best describes a reason for the discrepancy in the date of the last common ancestor of these species? ribosomal rna is not a reliable molecular clock and should not be used for dating. the neutral mutation rate used in calculating the last common ancestor date may not have been accurate. it is highly likely that the two organisms did not share a common ancestor, so the results are invalid. a large portion of the ribosomal rna is not vital to survival, so it is not likely to be well preserved.

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Biology, 21.09.2019 02:30, cupcake3103670

Idon't understand this! nucleotide substitutions occur by mistake in a segment of ribosomal rna at a constant rate of one substitution every 10,000 years. a biologist has compared the ribosomal rna of two modern0day species and found that they have six differences in their sequences. how many years ago did these species diverge from a common ancestor? (2 points) select one: a. 3,000 years ago b. 60,000 years ago c. 30,000 years ago d. 6,000 years ago

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Biology, 12.10.2019 19:30, tadvet1633

You are studying a eukaryotic gene that codes for the alpha-subunit in hemoglobin. what is the most likely result if base substitutions occur in the first nucleotide at the 5' end of an intron and also in the last nucleotide at the 3' end?

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