Conservation of developmental genes in evolution is supported by all of the observations except that mutations of homeotic genes often have similar phenotypic effects in animals. almost all animals have the same homeobox genes expressed at equivalent anterior-posterior locations. mutations of homeotic genes often have significant, nonlethal phenotypic effects. tunicates have homeotic genes in distinct chromosomal locations from other animals.
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- Choose all of the correct statements below regarding fertilization. Check All That Apply At fertilization the sperm is activated to initiate development.At fertilization the sperm is activated to initiate development. The timing by which sperm enter oocytes is species dependent and shows no clear evolutionary patterns.The timing by which sperm enter oocytes is species dependent and shows no clear evolutionary patterns. The loss of RNA is associated with the germinal vesicle stage of oocyte development.The loss of RNA is associated with the germinal vesicle stage of oocyte development. Chemotactic molecule secretion by marine organisms provides a chemical guidance cue for sperm to locate eggs.Chemotactic molecule secretion by marine organisms provides a chemical guidance cue for sperm to locate eggs. The cortical granule reaction and the acrosome reaction occur in eggs & sperm respectively and are required during gamete formation.Considering the evolution of species, could a gene that is conserved from yeast to humans have evolved to confer some of the complex traits that we observe in modern animals, like multicellularity? Briefly explain.Which of the following best explains the number of similarities between the amino acid sequences of the Drosophila Hedgehog protein and the Chicken Indian Hedgehog protein? O A. The Drosophila hedgehog gene evolved from hedgehogs, which are distantly related to birds. O B. Both genes evolved from a gene present in the last common ancestor of Drosphila and chickens, and the number of differences reflects the amount of time that has elapsed during the evolution of these two lineages. a During the evolution of Drosophila and chickens, a hedgehog like gene arose independently in each lineage, then the gene that arose in chickens diversified. A These genes are unrelated, and the fact that they are similar is only because the proteins need to have similar biochemical properties. They are unrelated because chickens don't have segments and Drosophila larvae don't have limb buds.
- Which of the following passages inaccurately describes the evolutionary process? Wings are a highly valuable structure for any species as they increase survivorship and dispersal capabilities. Insect wings are hypothesized to have evolved from dorsal extensions from their thorax that, over generations, were selected for as they helped to absorb solar energy, aiding in thermoregulation. AS mutations continued to accrue, muscles attached to those flaps, making them more motile, and uitimately setting the foundation for wingS. Mammals have three ossicles, or tiny bones, in their middle ear that aid the hearing: the malleus, the incus, and the stapes. The stapes is the oldest of the three bones, having evolved from the pharyngeal arch ll, called the hyoid arch. We know it's the oldest as it is found in tetrapods (the columella) and in some more recently evolved fish. The malleus and incus evolved from bones of their ancestral mammal-like reptiles jaws, the articular and the quadrate…Wyckoff et al. (2000. Nature 403:304-309) have proposed that some human male reproductive-associated genes have evolved by natural selection and not by neutral evolution. Part of the DNA sequence results of their study is shown below. Which gene(s) did seem to evolve by natural selection? Note: dn = number of substitutions per non-synonymous (replacement) sites and ds = number of substitutions per synonymous (silent) sites. dn ds Acrosin-Trypsin 0.138 0.064 Protamine 1 0.133 0.046 SRY 0.055 0.090 Histone H1 (testicular) 0.055…If myoglobin is found in all chordates, urochordates, and cephalochordates, b-globin is found in all vertebrates, a-globin in all ostracoderm descendants, z-globin in all gnathostomes, e-globin in all viviparous mammals, and d-globin in all eutherian mammals, then the most recent globin gene must be: myoglobin, found only in descendants of the chordates, urochordates, and cephalochordates zeta-globin (z-globin), found only in descendants of the ancestral gnathostome fishes epsilon-globin (e-globin), found only in descendants of the ancestral marsupials beta-globin (b-globin), found only in descendants of the ancestral vertebrates delta-globin (g-globin), found only in descendants of the ancestral eutherians
- Background: In class we did a project about m and m’s and there ability to evolve and natural selection. (Yes I know they can’t actually evolve it was just used as a example in class) however I can’t figure out this question. Occasionally a mutant may occur and produce a candy that is misshapen or Pointier or flatter than the rest. Often this proves to be a weakness, but a rare mutation may confer extra M&M durability. Other mutations in M&Ms could occur ( like ones that result in a new color). A mutant un you population represents a new _________. What goes in the blankEvolution in Humans: 1) describe several techniques that paleontologists today use to establish fossil age 2) describe how tracking changes in DNA sequence among related organisms can be used to create a migration mapMany species look similar as embryos. What causes them to appear different as adults? Why does the study of development give insights into evolutionary relationships?
- Evolution in Humans 1) explain what evolutionary mechanisms are involved in creating variation in populations 2) define homology and analogy and discuss examples of eachThe fact that geneticists may be able to activate and inactivate genes in a chicken embryo to re-create a dinosaur is the most important to evolutionary scientists because: Question 18 options: This would help provide evidence on a genetic level that could prove the theory of evolution. Of all birds, we have the most complete genetic data compiled for chickens. Of all chordates, birds (like chickens) are the most like dinosaurs. This will help to prove the theory of punctuated equilibrium.INTERPRET DATA Which of the primates in Figure 18-18 is the most distantly related to humans? Explain your answer. Figure 18-18 Differences in DNA nucleotide sequences as evidence of evolutionary relationships Comparing the same gene in different organisms provides a window into evolution. Here the differences in the non-protein-coding region of the -globin gene are compared between humans and other primates. Evolutionary biologists are rapidly expanding such studies from comparing one or several genes to comparing entire genomes.