What is the pitx1 gene responsible for in the

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Exam #3 Key

What is the Pitx1 gene responsible for in the embryonic development of mice from BIO 152 at University of Massachusetts, Amherst

28 )   Which of the following correctly complete the statement , " Sexual dimorphism is __________ " ? i . An evolutionary consequence of different levels of investment of males and females in mating and parental care . ii . Any difference between males and females , such as in morphology , physiology , or behavior . iii . Any morphological feature that is influenced by reproductive hormones . iv . A difference in the sexes that always takes the form of greater body size in males .
a ) 
b ) i and iii
c ) ii and iii
d ) ii , and iv
e ) i , ii and iv
Answer:  a )   i and ii
29 )   Females of sexually reproducing species are generally more ( not less ) selective than males when choosing a mate because :
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30 )   What is the Pitx1 gene responsible for in the embryonic development of mice ? ( homologies between stickleback fish and mice will help you with this one ) ?
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31 )   The male long - tailed widowbird ( seen in a video excerpt in class ) has an extremely long tail ( though the female of the species does not ) . The male ’s tail is so big that it seems to make flying difficult and energy - consuming , and the long tail must also make the male quite conspicuous to predators . According to the concept of sexual selection , this seemingly detrimental feature evolved because
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32 )   In zoos , lions and tigers mate and produce viable hybrid offspring called tiglons or ligers . Hybrids were never recorded in Asia , however , where their ranges once overlapped . Hybrids probably do not occur in nature because of :
a ) 
b ) gametic mortality
c ) behavioral isolation
d ) mechanical isolation
e ) temporal isolation
Answer:  a )   hybrid inviability
33 )   What other line of evidence supports the independent evolution of trichromatic vision in Howlers and higher primates ?
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34 )   What is the relationship between the toxicity of cholera and the quality of a country ’s water treatment practices ?
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35 )   How many years between mutations that would bring about UV vision in a common species of bird ?
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36 )   From the Evolutionary Arms documentary , what was the selective pressure that accounts for the extreme toxicity of the skin secretions of the rough - skinned newt ?
a ) a fungus that attacks the skin
b ) potentially lethal bites from rivals during male fights for territory .
c ) the toxicity is by - product for selection for gas exchange between their aquatic environment and the skin .
d ) 
e ) predation by shrews ( a small mammal )
Answer:  d )   predation by garter snakes .
37 )   What health practices in the United States have contributed to the evolution of drug resistant strains of bacteria ?
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38 )   In surf perch , what genetically determined trait setup the conditions for speciation by sensory drive ?
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39 )   Surf perch are an example of :
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40 )   What is the amino acid switch in opsin when UV vision evolves in birds ?
a ) 
b ) cysteine to serine
c ) glycine to serine
d ) serine to glycine
e ) glycine to cysteine
Answer:  a )   serine to cysteine
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Biochemistry
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Chapter 27 / Exercise 17
Biochemistry
Garrett/Grisham
Expert Verified
30) What is the Pitx1 gene responsible for in the embryonic development of mice? (homologies between stickleback fish and mice will help you with this one)? a) It transforms the developing gill arches into facial muscles and nerves. b) It triggers the development of claws. c) It is responsible for differences in the development of the hind and fore limbs. d) It is a trigger in the development of sexual dimorphisms.
31) The male long-tailed widowbird (seen in a video excerpt in class) has an extremely long tail (though the female of the species does not). The male’s tail is so big that it seems to make flying difficult and energy-consuming, and the long tail must also make the male quite conspicuous to predators. According to the concept of sexual selection, this seemingly detrimental feature evolved because
32) In zoos, lions and tigers mate and produce viable hybrid offspring called tiglons or ligers. Hybrids were never recorded in Asia, however, where their ranges once overlapped. Hybrids probably do not occur in nature because of:
33) What other line of evidence supports the independent evolution of trichromatic vision in Howlers and higher primates?
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Biochemistry
The document you are viewing contains questions related to this textbook.
Chapter 27 / Exercise 17
Biochemistry
Garrett/Grisham
Expert Verified
34) What is the relationship between the toxicity of cholera and the quality of a country’s water treatment practices? a) effective water treatment facilities : low toxicity b) ineffective water treatment facilities : low toxicity c) there is no relationship, other factors determine toxicity
35) How many years between mutations that would bring about UV vision in a common species of bird?
36) From the Evolutionary Arms documentary, what was the selective pressure that accounts for the extreme toxicity of the skin secretions of the rough-skinned newt?
37) What health practices in the United States have contributed to the evolution of drug resistant strains of bacteria?
38) In surf perch, what genetically determined trait setup the conditions for speciation by sensory drive? a) the differences in water depth of the two populations. b) the differences in the light environment of the two species. c) limited space in the retina for rod and cone cells. d) all of the above. e) none of the above.
39) Surf perch are an example of:
Extra Credit 40) What is the amino acid switch in opsin when UV vision evolves in birds?

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