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1. During the formation of the limb bud, the components of the zeugopodium develop in the presence of:
a. High concentrations of Fgf and low concentrations of Gli
b. High expression of Hox genes 9 and 10
c. High expression of Hox genes 10 and 11
d. Intermediate concentrations of Retinoic Acid and Wnt
e. Low concentrations of Retinoic Acid and Fgf
f. a and b
g. a and c
h. c and d
i. b and e
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- 1. After receiving the SR signal, stem cells in the developing organism will have an increased potential to specialize. The __ genes, when expressed, enable these embryonic stem cells the capacity to differentiate. A. SR B. Skin Diff C. ID D. Neural Diff E. DIV F. DET Please answer in short and ASAP .2. Choose the correct statements about the eye development A. Hh, which is expressed by the developing photoreceptors in the posterior eye disc, induces cells in the morphogenetic furrow (MF) to express DPP, which is the ligand of DPP (BMP) signaling. B. Wg and Notch signaling inhibit while Hh and DPP promote the co-expression of RD genes including Ey (Eyeless) and Eya (Eyes absent) in the preproneural (PPN) domain anterior to the MF. C. Eya, sine oculis (so), and Eyg (Eyegone) are the retinal determination (RD) network genes required for retinal determination and induction of atonal expression. D. EGFR signaling is required for the differentiation of all the photoreceptor neurons after R8 determination. In addition EGFR signaling is also required for maintaining cell survival in posterior eye discs. E. During Drosophila eye development, cell proliferation in the second mitotic wave is required to provide sufficient undifferentiated cells surrounding the differentiating photoreceptors…Which of the following is NOT true about the specification of the eye field? (Check all that apply) A ET induces RX, which in turn induces Otx2 and Pax6. B During late gastrulation, the forebrain and hindbrain are specified. Pax6 initiates the expression of a network of transcription factors, some of which mutually activate one another. D ET induces RX, which in turn induces Pax6 and blocks Otx2 within the eye field. ET induces RX, which in turn blocks Otx2 and Pax6. F During early gastrulation, Noggin promotes the expression of both ET and Otx2. During late gastrulation, Otx2 blocks the inhibition of ET by Noggin. H) It starts with neural induction when the neural plate is induced within the ectoderm. Pax6 is only required for the specification of the retina. During early gastrulation, Noggin indices Otx2 but blocks ET. E Feedback That's not correct
- 1. Match each of the terms in the left column to the bestfitting phrase from the right column.a. epistatic interaction 1. divide the body into identical units(segments)b. regulative 2. initiated by binding of ligand todetermination receptorc. modifier screen 3. individuals with cells of more thanone genotyped. RNAi 4. the fate of early embryonic cells canbe altered by the environmente. ectopic expression 5. assign identity to body segmentsf. homeodomain 6. substance whose concentrationdetermines cell fatesg. green fluorescent 7. suppression of gene expression byprotein double-stranded RNAh. genetic mosaics 8. method for identifying pleiotropicgenesi. segmentation genes 9. a DNA-binding motif found incertain transcription factorsj. homeotic genes 10. encode proteins that accumulate inunfertilized eggs and are needed forembryo developmentk. morphogen 11. double mutant has phenotype of oneof the two mutantsl. maternal effect 12. a gene is turned on in an inappropriategenes tissue or at…In early mammalian development, compaction would likely be blocked by inhibiting expression of which of the following? a. Beta-catenin. b. E-cadherin. c. Bcl2. d. Cdx2.A cytoplasmic determinant can control development at the early stages of development because....? Group of answer choices a. it is a universal activator of all genes b. it is present evenly throughout the cytoplasm c. it is activated by cell division d. it is controlled by genes present in the cytoplasm e. it is laid down in the egg cell by the mother
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