Bird beaks develop from an embryonic group of cells called neural crest cells that are part of the neural tube that gives rise to the spinal column and related structures. Amazingly, neural crest cells can be surgically transplanted from one embryo to another, even between embryos of different species. When quail neural crest cells were transplanted into duck embryos, the beak of the host embryo developed into a shape similar to that found in quails, creating the “quck.” Duck cells were recruited in addition to the quail cells to form part of the quck beak. Conversely, when duck neural crest cells were transplanted into quail embryos, the beak of the embryo resembled that of a duck, creating a “duail,” and quail cells were recruited to form part of the beak. What do these experiments tell you about the autonomy or non-autonomy of the transplanted and host cells during beak development?
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Genetic Analysis: An Integrated Approach (3rd Edition)
- Since all cells contain the same number of chromosomes and the overall same/similar genome how would the genome in a nerve cell work differently than the genome of a muscle cell? In other words what epigenetic processes cause these differences between cell types at the molecular levelarrow_forwardAnother way to study the role of proteins (e.g., transcription factors) that function in development is to microinject the mRNA that encodes a protein, or the purified protein itself, into an oocyte or embryo, and then determine how this affects the subsequent development of the embryo, larva, and adult. For example, if Bicoid protein is injected into the posterior region of an oocyte, the resulting embryo will develop into a larva that has anterior structures at both ends. Based on your understanding of the function of each developmental gene, what would be the predicted phenotype if the following proteins or mRNAs were injected into normal oocytes? A. Nanos mRNA injected into the anterior end of an oocyte B. Antp protein injected into the posterior end of an embryo C. Toll mRNA injected into the dorsal side of an early embryoarrow_forwardWhy the process of DNA is transcribed into mRNA and then translated into protein is referred to as the “central dogma” of biology? Give one scenario that would explain how a mutation in the DNA of the Piedmontese bull could lead to muscle hypertrophy. If more cows had the same musculature as the Piedmontese bull, how would that affect meat production in countries that use cows as a primary meat source?arrow_forward
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- A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Suppose that somite stem cells commit to their cell fates by three days post fertilization. Which result would be MOST likely in the chick embryos receiving somites transplanted in the reverse order? A. The organs arising from quail somites develop in a normal order because local signaling molecules appropriately pattern the developing organs. B. The organs arising from quail somites develop in a normal order because transcriptional programs activated in the nucleus cannot be reversed.…arrow_forwardYour friend can't understand how it is possible to combine a somatic cell from their pet with an oocyte from a different animal and create a clone of their pet. Won't the animal that develops be the offspring of the two animals rather than a clone of the animal that donated the somatic cell? Explain to your friend why this is not the case.arrow_forwardWoolly mammoths have been extinct for about 4,000 years, but we often find their well-preserved remains in Siberian permafrost. Research groups are now planning to use SCNT to resurrect these huge elephant-like mammals. No mammoth eggs have been recovered yet, so elephant eggs would be used instead. An elephant would also be the surrogate mother for the resulting embryo. The researchers may try a modified SCNT technique used to clone a mouse that had been dead and frozen for 16 years. Ice crystals that form during freezing break up cell membranes, so cells from the frozen mouse were in bad shape. Their DNA was transferred into donor mouse eggs, and cells from the resulting embryos were fused with undifferentiated mouse cells. Four healthy clones were born from the hybrid embryos. What are some of the pros and cons of cloning an extinct animal?arrow_forward
- given a situation in which you manipulated a zebrafish embryo by injecting high levels of retinoic acid so that no anterior genes will be expressed. Surprisingly, after embryonic development, you are still able to observed the presence of anterior structures. What could explain this observation? What changes in your experiment would you make to achieve your objective?arrow_forwardExplain the difference between asymmetric and symmetric cell division. When the pool of stem cells for a particular tissue needs to expand, which of these two cell division mechanisms is utilized?arrow_forwardIn somatic cell nuclear transfer, the nucleus of a somatic cell is inserted into an enucleated egg. The resulting embryo is implanted into a surrogate mother. The nuclear genome of the resulting cloned animal will genetically identical to that of ["the original somatic cell", "the surrogate mother", "the enucleated egg"] , and the mitochondrial DNA of the cloned animal will be identical to that of ["the somatic cell", "the enucleated cell", "the surrogate mother"] . Pick answers within quotation marks to fill in the blanks.arrow_forward
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