1. MORPHOLOGICAL VARIATIONS IN DIFFERENT STRAINS OF DROSOPHILA MELANOGASTER Features Wild Ebony Dumpy White-eyed Dumpy-ebony 1. 2. 3. 4. 5. 6. 2. GIVE PICTURE AT LEAST SIX (6) SPECIMENS OF ONE SPECIES OF INVERTEBRATES SHOWING ANY MORPHOLOGICAL VARIATIONS.
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- In 1988, neurologists in Australia reported the existence of identical twins who had developed myoclonic epilepsy in their teens. One twin remained only mildly affected by this condition, but the other twin later developed other symptoms of full-blown MERRF, including deafness, ragged red fibers, and ataxia (loss of the ability to control muscles). Explain the phenotypic dissimilarity in these identical twins.Explain your answer in not less than 4 sentences: The easily observed external structures in insects, such as different pairs of legs, antennae, and wings form from imaginal discs. a) How is the identity of the different Drosophila imaginal discs established in the embryo—for example, how is it determined whether a disc will form a wing, a leg, or some other structure? b) Dominant mutants in the gene Antennapedia result in fore legs forming in the location where antennae are expected. How does this mutant phenotype illustrate your response to Part a?19. Instantaneous speciation" can best be described as _________. A. sympatric speciation B. ecological speciation C. speciation by polyploidy D. allopatric speciation E. there is no such thing
- 4. Birds are sometimes called avian reptiles. Discuss why this description is appropriate8) What data would suggest that a species evolutionary history includes sexual selection as a mechanism that helped shape the species? A) If males and females are significantly different from each other (sexual dimporphism) B) If some males reproduce with multiple females while other males do not reproduce C) If males engage in "risky" behavior D) If males and females form different social groups (i.e. herds are formed from either males or females but not both)1. describes two independent sources of evidence that have been used to estimate when maize was first domesticated: genetic evidence and archaeological evidence. a. How did archaeological evidence support the genetic evidence for the timing and geographic location of maize domestication? b. Describe this archaeological evidence.
- 8. Hox genes are important primarily because they regulate _________. A. gene expression during embryonic development (e.g., affecting appendage length/location) B. energy processing of the individual, thereby affecting fitness C. immune system responses to Pox viruses (e.g., chicken pox) D. lower coelom development, including internal organs E. reproductive capacity in adulthood and therefore Darwinian fitness2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a.Temporal isolation. b.Mechanical isolation. c.Low hybrid viability. d.Gametic isolation.8. About 70% of people get a bitter taste from the chemical phenyl thiocarbamide (PTC), while the other 30% do not. The ability to taste this chemical (T) is a dominant characteristic, while taste-blindness to it is recessive (t). Tongue-rolling ability is dominant (R), while the inability to roll the tongue is recessive (r). A tongue-rolling woman who is taste-blind for PTC has a father who could not roll his tongue but could taste the PTC chemical. She marries a man who can taste PTC but cannot roll his tongue. His mother was taste-blind to the chemical. Show the possible children this couple could produce.
- 1. What are the reasons why Philippine tarsiers cannot be found in Cebu despite it being near to Bohol, instead it found in Samar, Leyte, and Mindanano? Discuss the reason and explain it. Do not just copy it from somewhere, please.A dominant mutation in Drosophila called Deltacauses changes in wing morphology in Delta/+ heterozygotes. Homozygosity for this mutation (Delta /Delta) is lethal prior to the adult stage. In a population of 150 flies, it was determined that 60 hadnormal wings and 90 had abnormal wings.a. What are the allele frequencies in this population?b. Using the allele frequencies calculated in part (a),how many total zygotes must be produced by thispopulation in order for you to count 160 viableadults in the next generation?c. Given that there is random mating, no migration,and no mutation, and ignoring the effects ofgenetic drift, what are the expected numbers ofthe different genotypes in the next generation if160 viable offspring of the population in part(a) are counted?d. Is this next generation at Hardy-Weinberg equilibrium? Why or why not?740 Chapter 21 Variation and Selection in PopulationsDo Q1 Applying concepts both part a as well as b
