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What is a meristem? Explain the role of meristems in plant development.
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- Using the 'ABC model' of floral development, what would you expect the flowers of a mutant plant to look like if both A & B gene function had been destroyed?What is the function of the basal cell and terminal cell in plant embryo development?Compare and contrast how maternal-effect genes, gap genes, and homeotic genes affect Drosophila development.
- a. What are the physical differences and similarities in the reproduction systems of plants and animals? b. What is the difference of morphogenesis in plants and animals?How do plants and animals differ in the ways their cells adhere, communicate, and differentiate during development?How have we discovered that specific genes control development in an organism like Drosophila?
- Discuss the role of homeotic genes in development. Explain what happens to the phenotype of a fruit fly when a gain-of-function mutation in a homeotic gene causes the protein to be expressed in an abnormal region of the embryo. What are the consequences of a loss-of-function mutation in such a gene?As shown in Figure 13-26, the Sonic hedgehog gene is expressed in many places in a developing chicken. Is theidentical Sonic hedgehog protein expressed in each tissue? If so, how do the tissues develop into different structures? If not, how are different Sonic hedgehog proteinsproduced?How does an undifferentiated plant cell “know” what type of cell to differentiate into (what are the two broad cues a plant uses to determine a cell's fate)?
- Can you clearly type the answers to the all the parts to this question please a) What is the role of the LEAFY gene in floral development? (b) What is the phenotype of the leafy mutant? (c) Most of the ABC program genes are directly regulated by the transcription factor LEAFY (LFY). Still, LFY is expressed broadly throughout the floral meristem when the discrete A, B, and C domains are established. Discuss how this single broadly expressed transcription factor can generate distinct domains of ABC gene expression. Feel free to use diagrams.Which of the curves shown in the figure best represents the developmental potential of cells as they progress through development? Briefly justify your answer.Can you solve all the parts to this question please a) What is the role of the LEAFY gene in floral development? (b) What is the phenotype of the leafy mutant? (c) Most of the ABC program genes are directly regulated by the transcription factor LEAFY (LFY). Still, LFY is expressed broadly throughout the floral meristem when the discrete A, B, and C domains are established. Discuss how this single broadly expressed transcription factor can generate distinct domains of ABC gene expression. Feel free to use diagrams.