Case Study Sheet 4: Biology Answers

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Mirna Gazer May 1st, 2012 General Biology I Study Sheet 4: Biology 130 This study sheet is meant to guide you in your studying and this material is what you need to know for the FOURTH exam on Tuesday, May 1st. You need to convince yourself that you truly know these answers and this terminology. Your answers will be turned in on the day of the exam – think of it as your admissions ticket. . As always, I am available to answer any and all questions. 1. Explain the relationship between cancer and cell division. Cancer→ Is the uncontrolled of cells. Tumors are just massive clusters of cells that are dividing out of control. Cell division→ Is natural and controlled by the body. It is happening every second of everyday. Our body…show more content…
13. What is the difference between meiosis I and meiosis II (10.2)? Meiosis I→ Homologous paired chromosomes separate. Meiosis II→ Sister chromatids separate. 14. What is going on during crossing-over events (this is somewhat complicated and obscure)? 10.3 Does crossing-over occur during meiosis I or meiosis II? Crossing over is when two chromosomes switch their genes around. (A 1 a, B 1 b, C 1 c, D 1 d). When crossing over occurs, the chromosomes will cross and the genes will be exchanged from one chromosome to another. (A 1 a, b1 B, c 1 C, D 1 d). Crossing-over occurs during meiosis I. 15. What is meant by independent assortment of chromosomes? At what phase of meiosis I or II does this occur? Each pair of alleles segregates independently during meiosis. Or each chromosome of a pair can be individually picked. 16. Explain two ways in which children can have different chromosomes (gene variation) than their mother or father. Random separation of chromosomes (law of segregation) when forming sperm/ova during anaphase I, crossing over of some genes to the homologous chromosomes during prophase I, and mutation during S…show more content…
What is meant by homozygous and heterozygous? Homozygous→ When the alleles from both parent are the same. Heterozygous→ When the alleles from both parents are different. 21. What did Gregor Mendel contribute to the study of biology and what 7 plant traits did he study? Gregor Mendel was the first person to comprehend some of the most basic principles of genetics, and use his experimental subject a species of garden pea. He looked at 7 characters in his plants such attributes as seed color and texture. In his plants, each of these characters came in two verities or traits, one of them dominant and the other recessive. Flower color or purple or white. Flower position is on stem or at tip. Stem length is tall or dwarfs. Seed shape is smooth or wrinkled. Seed color is yellow or green. Pod shape is inflated or wrinkled. Pod color is yellow or green. 22. What is meant by dominant and recessive? Why does the term heterozygous not apply to someone with a recessive phenotype? Dominant allele- Two alleles of an inherited pair differ, then one determines the organism’s appearance. Recessive allele- It has no noticeable effect on the organism’s

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