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Chapter 24: Problem 21

Drasopbila mauritiana inhabits the island of Mauritius in the Indian Ocean. Drosopbila simulans, a close relative, is widely distributed throughout the world. What experimental tests would you perform to determine if D. maturitiana and D. simulans are genetically different species?

Short Answer

Expert verified
Conduct mating experiments, analyze DNA, and examine morphological, ecological, and behavioral differences.

Step by step solution

01

Observe Morphological Differences

First, we need to observe any morphological differences between Drosophila mauritiana and Drosophila simulans. This includes studying physical characteristics such as wing size, body coloration, and other anatomical features under a microscope. Differences might suggest genetic divergence.
02

Conduct Mating Experiments

Set up controlled mating experiments between individuals from both species. If individuals produce fertile offspring, they may be considered the same species. However, if they produce sterile offspring or do not mate at all, they are likely to be different species.
03

Analyze Genetic Material

Extract DNA from individuals of both species and perform genetic analyses like DNA sequencing. Look for significant differences in their genetic makeup, such as variations in specific genes or overall genomic differences, to determine if they are separate species.
04

Examine Ecological and Behavioral Aspects

Study the ecological roles and behaviors of each species, including habitat preference, feeding habits, and behavioral patterns. Differences in these areas can suggest evolutionary adaptations that have led to speciation.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Genetic Divergence
Genetic divergence refers to the process where two or more populations of an ancestral species accumulate genetic changes, leading them to become distinct species over time. This can happen for a variety of reasons:
  • Geographical isolation: When populations are separated by physical barriers such as rivers or mountains, they evolve independently, as seen in organisms inhabiting islands.
  • Reproductive isolation: Factors such as different mating seasons or mechanisms can prevent interbreeding between groups, fostering divergence.
  • Mutation, selection, and genetic drift: Random genetic mutations, natural selection, and genetic drift contribute to the accumulated differences at the genetic level.
Drasopbila mauritiana and Drosopbila simulans might experience these processes, resulting in genetic divergence. This can eventually lead to full speciation, where the two can no longer interbreed and produce viable offspring.
Morphological Differences
Morphological differences involve examining the physical characteristics that distinguish one species from another. When studying species like Drasopbila mauritiana and Drosopbila simulans:
  • Observe differences in size, such as wing length or body proportions.
  • Examine the coloration and patterns on the body.
  • Analyze unique anatomical features, such as differences in antennae or leg structure.
These distinctions are vital for identifying potential speciation. If significant differences are observed, it may suggest that genetic divergence has occurred. However, it's crucial to note that morphological data alone may not provide a complete picture, as some differences could be adaptations to different environmental conditions rather than true genetic divergence.
Mating Experiments
Mating experiments are a practical approach to determine if two populations are separate species. Here's how they work:
  • Introduce individuals from both populations and observe if they mate.
  • If mating occurs, observe the viability and fertility of the offspring. Fertile offspring suggest the populations are the same species, while sterile offspring or failure to reproduce suggest reproductive isolation.
  • Note any behavioral or physical barriers to mating, which could indicate different species status.
For Drasopbila mauritiana and Drosopbila simulans, these experiments could reveal important insights into their reproductive compatibility, thus shedding light on their species classification.
DNA Sequencing
DNA sequencing involves analyzing the genetic material of organisms to detect variations and relationships between them. This method can confirm if Drosopbila mauritiana and Drosopbila simulans are distinct species. Here鈥檚 how it helps:
  • Isolate and sequence DNA from both species to compare genetic sequences.
  • Look for significant genetic variants or mutations that differentiate them.
  • Assess the genomic similarities and differences, focusing on genes known to influence speciation.
DNA sequencing provides robust evidence for speciation because it directly examines the genetic makeup. Any major divergences in their genomes would strongly support the conclusion that they are indeed separate species.

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Most popular questions from this chapter

The prune gene (symbol \(p n\) ) is X-linked in Drosophila melanogaster. Mutant alleles of this gene cause the eyes to be brown instead of red. A dominant mutant allele of another gene located on a large autosome causes hemizygous or homozygous \(p n\) flies to die; this dominant mutant allele is therefore called Killer of prune (symbol \(K p n\) ). How could mutants such as these play a role in the evolution of reproductive isolation between populations?

Ribonuclease, a protein that degrades \(\mathrm{RNA}\), is 124 amino acids long. A comparison between the amino acid sequences of cow and rat ribonucleases reveals 40 differences. What is the average number of amino acid substitutions that have occurred per site in these two evolutionary lineages? If the cow and the rat lineages diverged from a common ancestor 80 million years ago, what is the rate of ribonuclease evolution?

Darwin stressed that species evolve by natural selection. What was the main gap in his theory?

Within the coding region of a gene, where would you most likely find silent polymorphisms?

A geneticist has studied the sequence of a gene in each of three species, \(A, B,\) and \(C .\) Species \(A\) and species \(B\) are sister species; species \(C\) is more distantly related. The geneticist has calculated the ratio of nonsynonymous (NS) to synonymous (S) nucleotide substitutions in the coding region of the gene in two ways - first, by comparing the gene sequences of species \(A\) and \(C,\) and second, by comparing the gene sequences of species \(\mathrm{B}\) and \(\mathrm{C}\). The NS:S ratio for the comparison of species \(B\) and \(C\) is five times greater than it is for the comparison of species A and C. What might this difference in the NS:S ratios suggest?
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