MBG 2400 Exam Questions with Complete Correct Answers | Grade A+

Difference between Plant and Animal Life cycle? Ans: Plant(more complex): Start off with a diploid (2 chromosome sets) after the young individual organism undergo meiosis and then we produce haploid (1n) spores then they undergo mitosis that produces a gametophyte (something that is multicellular). Male side we have pollen and female side we have an egg in haploid structure. 2n forms in zygote. Animals: 2n to n and there is meiosis that directly results in fromation of gemtes. What part of the pant becomes a seed once it is fertilized Ans: Ovules- 1 megaspore(female spore) is it How many cells are in microspore Ans: pollen mother cell goes through meisos to porduce pollen tetrad. then dissociation to make microspore. Then nucleus migrates and mitosis 1 and mitosis 2 happen to produce. 1 - vegatitive (sperm cells feed off of it, generative cell goes beside it ) sperm and 2 sperm cells at end 2 How many divisions do Megaspores go through Ans: Megaspore mother cell goes through Meiosis 1 and 2- at this point its a megaspore with functions- degeneration and dissaaperance of other cells and only one cell remains. then goes through mitosis 3 times- 1 to 2 to 4 then 8. overall comes out to be 7 cells and 8 nuclei. one cell is the egg still. How many cells Ans: What does the pollen land on top of? Ans: Pistil what does the vegetative cell do. Ans: creates elongated pollen tube, and also feeds the embryo sac What is in a megagametophyte Ans: 7 cells and 8 nuclei (6 of which are in antipodal cells, 2 are just in the whole cell) The law segregation Ans: two alleles for each trait will seperate from one another during gamete formation. 3 Test crosses Ans: cross with reccessive aa. Mendels 2nd law Ans: Alleles of two more genes are assorted independently. formula for gamete genotypes Ans: 2^n n=number of genes formula for number of progeny genotype