What is the distance between these two genes?
You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ b+ b+) and (l+ l b+ b) flies are normal, but (l l b b) flies don't move around very much and cannot detect the location of a light source. You perform a testcross with a doubly heterozygous fruit fly and get the following results:
listless, sighted: 100
listless, blind: 400
normal activity:, sighted 400
normal activity:, blind 100
A. They are on different chromosomes.
B. They are 10 map units apart.
C. They are 20 map units apart.
D. They are 40 map units apart.
E. They are 80 map units apart.
C. They are 20 map units apart.
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Which of the following is an appropriate interpretation for these graphs?
Maternal care (as measured by minutes crouching over offspring and proportion of pups retrieved) in female mice that have the fosB allele is
A. less than the maternal care given by female mice without the fosB allele.
B. greater than the maternal care given by female mice without the fosB allele.
C. the same as the maternal care given by female mice without the fosB allele.
D. less than the maternal care given by female mice without the fosB allele; however, the graphs depict only minor differences, which are most likely not significant.
E. not possible to determine from the data.
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 the relationship between maternal behavior and a particular allele? 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?
Reflection 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?
Each enzyme has a particular substrate because enzymes
A. have active sites complementary in shape to their substrates. B. are named for their substrate. C. decrease the productivity of the cell. D. always require coenzymes. E. increase the energy of activation.
Which of the following could result in the most serious type of mutation?
A. A nucleotide substitution in an exon. B. A nucleotide deletion in an exon. C. A nucleotide insertion in an intron. D. A nucleotide substitution in an intron. E. More than one of these would be most serious.
An enzyme ____ the activation energy required for a chemical reaction.
A) increases B) lowers C) converts D) catalyzes