Choose the true statements about the evolution of larval dispersal in marine snails.
A. Cladistics shows that there are more instances of the transition from dispersing to non-dispersing larvae than the reverse.
B. Loss of structures in the transition from dispersing to non-dispersing may inhibit evolutionary reversal.
C. Possession of dispersing larvae is the ancestral state in snails.
D. The evolution of non-dispersing snails is likely to hinder speciation.
E. Clades of non-dispersing snails are less species rich than those of dispersing snails.
Answer: C
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Your friend found out that the soybeans her grandfather planted were genetically modified to be resistant to the herbicide Roundup. She wants to know what “genetically modified” means. You tell her that:
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How has climate change altered the mountain pine beetle?
A) They are being outcompeted by the prairie pine beetle. B) They now have two generations per year. C) They have decreased the average elevation of their distribution. D) Their abundance has increased through lack of predators due to mismatched phenology.
Cis-regulatory and trans-regulatory elements are important for evolutionary changes to morphology because
A. Changes to the loci acted on by cis- and trans- regulatory elements affects which genes are expressed, how much, and when B. Cis- and trans- regulatory elements evolve rapidly C. Mutations in cis- and trans- regulatory elements can create novel proteins D. Mutations to cis- and trans- regulatory elements can alter the genotype without affecting the phenotype
Multiple Sclerosis (MS) is autoimmune disease that is originated by degeneration of (i) ________. Presence of "plaque" observed in the MRI image of patient is (ii) __________________________
a) (i) Schwann cell, (ii) scar tissue derived from damaged myelin b) (i) oligodendrocyte, (ii) scar tissue derived from damaged myelin c) (i) oligodendrocyte, (ii) aggregation of amyroid proteins d) (i) Schwann cell, (ii) aggregation of amyroid proteins