A codon is a particular combination of three nucleotides. Therefore, there are ________ possible combinations of the nucleotides A, C, G, and T
A) 16
B) 4
C) 12
D) 64
E) 32
D
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According to these data, what is the distance, in centimorgans, between these 2 gene loci? (Enter the number only without the units. For example, 100 cM would be entered as 100)
In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another gene locus on the same chromosome, there is a dominant gene for red eyes and its recessive allele for purple eyes. A male that was heterozygous at both gene loci was mated with a female that was homozygous for both recessive alleles and the following results were observed among the offspring: Normal wings and red eyes - 420 Vestigial wings and red eyes - 80 Normal wings and purple eyes - 70 Vestigial wings and purple eyes - 430 What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about linkage mapping by recombination? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If a mammal suffered damage to the temperature sensor in its brain, what would be the result?
A. The integrating center would not receive inputs to compare to the set point. Body temperature could rise or fall to dangerous levels. B. Only the integumentary system is required to sense temperature changes. Body temperature would remain stable. C. The animal would have to rely on shivering instead of vasoconstriction to maintain body heat. D. The animal would fall back onto a more primitive ectothermic mode of regulation. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about temperature regulation? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A missense mutation causes sickle cell disease by
A) altering the protein's shape and affecting its function. B) changing a sense codon to a stop codon. C) altering an intron splicing site so that an entire exon is deleted. D) substituting beta globin chains with alpha globin chains.
What value do mortality rate curves end on?
A) 0 B) 1.0 C) however many individuals are dead D) the percentage of the population that dies in the last time period