WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
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?
(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.
Chapter 12 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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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_forwardWhy 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_forwardBirds have wings, as do butterflies and mosquitos. However, they do not share a recent, common ancestor. Therefore, the possesion of wings in this scenario is known as?arrow_forward
- Q1: A child with a heterozygous genotype for eye color will manifest which eye color? (Assuming blue is recessive, and brown is dominant allele for eye colors) A. GreenB. The child will have Heterochromia iridumC. BlueD. Brown Q2: F1 ligers can reproduce, but their succeeding generations lose this ability, what is happening?A. Speciation happensB. Hybrid inviability happensC. Hybrid breakdown happensD. Hybrid sterility happens Q3: A population tested with the Hardy Weinberg equation results to 1=1. What does this imply? A. The population has some individuals with mutated genesB. The population is gradually changingC. There is a disaster that decimated the populationD. The population is not changingarrow_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_forwardNonearrow_forward
- The 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_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_forwardA. Direction: For each of the five examples below, give the name of the isolating mechanism and specify if it is prezygotic or postzygotic isolation. a. In some bee population, only large bees are big enough to unfold flower petals and obtain nectar and pollen. b. A cross between two fish species occurs but development only occurs up to 16-cell stage. c. In drosophila, when sperm form one species enters the other species, the sperm is immobilized and unable to fertilized egg. d. Fireflies have a unique lighting pattern. The frequency of lighting is species specific. Fireflies in the same area will not mate with those having a different lighting frequency. e. Two species of butterflies are found in northern Michigan, but one species is found only near rivers and streams, the other near lakes. B. Read analyze the statements given below. Then, justify your answer. a. A common farming practice is to breed a female horse with a male donkey. The result is a very robust animal – the mule.…arrow_forward
- Identify the most accurate statement about population variation. a. Allopolyploidy occurs when chromosomes fail to separate during gametogenesis and then self-fertilization results in a tetraploid offspring. b. Chromosomal duplications and deletions cause large changes due to the changes in gene dosage. c. Traits that are influenced by both environment and genetics are unlikely to be influenced by evolution. d. Gene duplications and deletions occur frequently during equal crossing over that occurs during meiosis I.arrow_forwardDiscuss different causes of speciation, in evolutionary biology.arrow_forwardA 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_forward
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