A woman is know to be carrying a severe recessive autosomal gene. It is possible to determine whether a cell or poloar body is carrying the normal or dissorder recessive. The detection procedure destroys the ovum.
She has opted for in vitro fertilization so the the egg and sperm can be united in a test tube. To avoid having to select a normal embryo and destroy others, she wants to be certain the egg is not carrying the mutation. It is possible to have the oocyte continue meiosis in a test tube.
What would you want to see in the poloar body at the first meiotic division? What would you want to see in the second meitoic division? You must be able to diagram oogenesis and segregation of the genes. Do not give probabilities, only certainy.© BrainMass Inc. brainmass.com October 24, 2018, 5:32 pm ad1c9bdddf
Remember that in the first step of meiosis, an oocyte divides, with one set of homologous chromosomes going into each of the daughter cells. One of those cells will get the majority of the cytoplasm, and will go on to divide again in the second step of meiosis, while the other daughter cell will become a polar body. At the second step of meiosis, the sister chromatids separate to form an ovum with one set of single-chromatid chromosomes, while the other part of the cell from that division becomes another polar body.
So, assume that the woman who wishes to become pregnant is only carrying one ...
Mitosis and meiosis for severe recessive autosomal genes are analyzed. The detection procedure to destroy the ovum is analyzed.
4 Biology Problems
1. The integrity of the plasma membrane is essential for cellular survival. Could the immune system utilize this fact to destroy foreign cells that have invaded the body? How might cells of the immune system disrupt membranes of foreign cells? (Two hints: virtually all cells can secrete proteins, and some proteins form pores in membranes.)
2. Most cells are very small. What physical and metabolic constraints limit cell size? What problems would an enormous cell encounter? What adaptations might help a very large cell to survive?
4. Some species of bacteria that live at the surface of sediment on the bottom of lakes are facultative anaerobes; that is, they are capable of either aerobic or anaerobic respiration. How will their metabolism change during the summer when the deep water becomes anoxic (deoxygenated)? If the bacteria continue to grow at the same rate, will glycolysis increase, decrease, or remain the same after the lake becomes anoxic? Explain why.
5. Often, prokaryotic cells exist as simple unicellular organisms, but in some species, prokaryotic cells can grow together in colonies or filaments. In addition, some species, such as Cynaobacteria or Myxobacteria, demonstrate intercellular communicate , or might even produce specialized cells and structures. However, only eukaryotic cells form the bodies of multicellular organisms with complex internal specialization. Develop one or two hypotheses explaining why only eukaryotic cells are found in multicellular organisms.View Full Posting Details