WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 12, Problem 4MC
Summary Introduction
Introduction:
‘Ploidy’ refers to the number of sets of chromosomes in an organism.
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3) Allopolyploidy involves
a.a genetic divergence that results in nonviable offspring.
b.a decrease in chromosome number within a single species.
c.an increase in chromosome number following hybridization of different species.
d.an increase in chromosome number within a single species.
In Figure 2 a diagram shows how traits are shared (or not shared) in different generations. Based on the diagram:
a. A, represents a plesiomorph trait. In how many generations is A shared (symplesiomorph)?
b. C represents an apomorphictrait. What generations share C (synapomorphy)?
c. E is considered an autapomorphic trait. Why do you think?
d. What about B and D? How do we classify them?
A major mechanism of speciation in plants but not in animals isa. adaptation to new environments.b. polyploidy.c. hybrid breakdown.d. genetic changes that alter the organism’s niche.e. both a and d.
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WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Explain the type of speciation (allopatric, parapatric, or sympatric) most likely to occur under each of the following conditions: A. A pregnant female rat is transported by an ocean liner to a new continent. B. A meadow containing several species of grasses is exposed to a pesticide that promotes nondisjunction. C. In a very large lake containing several species of fish, the water level gradually falls over the course of several years. Eventually, the large lake becomes subdivided into smaller lakes, some of which are connected by narrow streams.arrow_forward(d) Scientists believe that the yellow fern arose from hybridization with another fern on the island. Create a diagram of this hybridization that tracks the origin of the chromosome number in the yellow fern.arrow_forwardDefine speciation genes. and What is the importance of speciation genes?arrow_forward
- Why does sympatric speciation via allopolyploidy occur? A. When disruptive selection and assortative mating act contemporaneously (during the same time) B. When strong prezygotic isolation prevents hybridization between two species C. When meiotic error in a single species results in unreduced gametes that can self-fertilize D. When individuals of two species mate and their offspring are sterile but eventually produce unreduced gametes that self-fertilize O E. When geographic isolation and natural selection occur contemporaneouslyarrow_forwardWhich of the following statements is an evolutionary advantage of sex and sexual reproduction? A. Sex and recombination results in decreased genetic variation in a population and maintains advantageous traits. B. Sex and recombination can bring beneficial alleles together when producing offspring. C. Sex and recombination results in the inheritance of all the genetic information available from both parents. D. Reproduction is less risky when gametes from two individuals must fuse.arrow_forwardThe biological species concept is based on the assumption that species are reproductively isolated and do not share genes. And yet a number of organisms that are considered different species hybridize (mate and exchange genes). Hybridization between different species is more common in plants than in animals. Propose some possible reasons for this difference.arrow_forward
- An organism that has two different alleles for a single trait is said to be for that trait. Select one: O O O a. heterologous b. heterozygous c. homozygous d. haploid e. diploidarrow_forward2) 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.arrow_forwardWhich of the following is an example of postzygotic reproductive isolation?a. Sperm of species A dies in the oviduct of species B before fertilization can take place.b. Hybrid zygotes between species A and B are spontaneously aborted early indevelopment.c. The mating seasons of species A and B do not overlap.d. Males of species A are not attracted to the pheromones produced by the females ofspecies B.arrow_forward
- A gene pool is a. all of the genes in a single individual. b. all of the genes in the gametes from a single individual. c. all of the genes in a population of individuals. d. the random mixing of genes during sexual reproduction.arrow_forwardSeveral new tetraploid species of a plant called salsify (Tragopogon) have arisen in western North America. These new species each arose from a diploid species that went through the process of allopolyploidy. This mode of speciation is a type of ________ and it occurs ________. A. allopatric speciation; almost instantaneously B. sympatric speciation; gradually C. allopatric speciation; very slowly D. sympatric speciation; quicklyarrow_forward1. Which of the ff is NOT a form of asexual reproduction? A. Budding B. Fission C. Fragmentation D. Pollination 2. What are the ff is true about sexual reproduction? A. Genetically identical offspring are produced B. Only one parent is involved C. It puts animals at an evolutionary disadvantage in terms of variation D. It involves the exchange of Genetic material between two individuals 3. How goes genetic variation influence a species survival? A. Increases ability to adapt to environmental changes B. Decreases ability to adapt to environmental changes C. Make reproduction more likely D. Increases the number of individuals available to re produce witharrow_forward
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