C Which of the following is a true statement concerning genetic variation? It is
ID: 151596 • Letter: C
Question
C Which of the following is a true statement concerning genetic variation? It is created by the direct action of natural selection It must be present in a population before natural selection can act upon the population. It tends to be reduced by the processes involved when diploid organisms produce D It arises in response to changes in the environment. gametes A population that has a higher average heterozygosity has less genetic variation than one with a lower average heterozygosity In peas, a gene controls flower color such that R purple and r white. In an isolated pea patch, there are 36 purple-flowering plants and 64 white-flowering plants. Assuming Hardy-Weinberg equilibrium, what is the value of q for this population? 0.36 0.64 0.75 0.80 The Pitx1 gene is a regulatory gene that is expressed in various locations in the developing embryo. The diagram below is a simplified schematic representing the genetic elements involved in the expression of the Pitx1 gene. The box labeled A represents the protein-coding region of the Pitkl gene. The boxes labeled 8 and Care regulatory switches, each one controls the expression of Pitx1 gene in a different location within the embryo Bitne l protein-coding region Controls expression of expression of Pitx in the jaw Pitx in the pelvis Pit regulatory protein Controls If a mutation should occur the box labeled C, which one of the following is the likely result? Due to the mutation, Pitxl is rendered nonfunctional and would not be expressed in either the jaw or the pelvis. Due to the mutation, Pitx1 would be expressed in the jaw region but not in the pelvis Due to the mutation, Pitx1 would be expressed in the pelvis region but not in the jaw region a. d...There would be no effect from the mutation since it occurred outside of the coding regionExplanation / Answer
Answer:
1. True statement concerning genetic variation is :It must be present in a population before evolution can occur in the population.
Hence,option(c) is correct answer.
2. In peas, a gene controls flower colour such that R = purple and r = white. In an isolated pea patch, there are 36 purple-flowering plants and 64 white-flowering plants. Assuming Hardy-Weinberg equilibrium, value of q for this population is .8
Hence,option(d) is correct.
3. Result of this case is due to the mutation,pitx1 is rendered non-functional and would not be expressed in either the jaw or pelvis region.
Hence,option(a) is correct.
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