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Patterns of Heredity

the BIG idea. CHAPTER OUTLINE. CHAPTER RESOURCES. CHAPTER. NEW CHAPTER. Patterns of Heredity. In sexual reproduction, genes are passed from parents to offspring in predictable patterns. 4.1. Living things inherit traits in patterns. 4.2. Patterns of heredity can be predicted. 4.3.

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Patterns of Heredity

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  1. the BIG idea CHAPTER OUTLINE CHAPTER RESOURCES CHAPTER NEW CHAPTER Patterns of Heredity In sexual reproduction, genes are passed from parents to offspring in predictable patterns. 4.1 Living things inherit traits in patterns. 4.2 Patterns of heredity can be predicted. 4.3 Meiosis is a special form of cell division.

  2. alleles a gene SIMULATION CLASSZONE.COM Try a virtual version of Mendel’s experiment. 4.1 Living things inherit traits in patterns. Offspring inherit alleles, which are forms of genes, from their parents. Alleles come on chromosome pairs and can be dominant or recessive. sexual reproduction gene heredity allele The alleles you have are your genotype; the observable characteristics that come from your genotype are your phenotype. phenotype genotype dominant recessive CHAPTER RESOURCES SECTION OUTLINE

  3. b B B Bb BB SIMULATION b CLASSZONE.COM Predict offspring traits with virtual Punnett squares. bb Bb 4.2 Patterns of heredity can be predicted. Punnett squares show possible outcomes of heredity. Punnett square Ratios and percentages can be used with Punnett squares to express the probability of particular outcomes. ratio probability percentage B = black fur b = brown fur CHAPTER RESOURCES SECTION OUTLINE

  4. Meiosis I Meiosis II 1n 1n 1n 1n 4.3 Meiosis is a special form of cell division. • At the beginning of meiosis I, the parent cell has two copies of each chromosome pair. gamete • During meiosis I, the homologs of the chromosome pair separate; there are two cells, each with two copies of one homolog from each pair. egg sperm • During meiosis II, the two copies of each homolog separate; each daughter cell has one homolog. fertilization meiosis CHAPTER RESOURCES SECTION OUTLINE

  5. 4.1 Living things inherit traits in patterns. I. Living things inherit traits in patterns. sexual reproduction • A. Parents and offspring are similar. gene • B. Genes are on chromosome pairs. heredity • C. Gregor Mendel made some important discoveries about heredity. allele phenotype genotype • 1. One Example dominant • 2. Mendel’s Conclusions recessive • D. Alleles interact to produce traits. • 1. Phenotype and Genotype CHAPTER RESOURCES • 2. Dominant and Recessive Alleles KEY CONCEPT SUMMARY

  6. 4.2 Patterns of heredity can be predicted. II. Patterns of heredity can be predicted. Punnett square • A. Punnett squares show possible outcomes for inheritance. ratio probability • B. Ratios and percentages can express the probability of outcomes. percentage CHAPTER RESOURCES KEY CONCEPT SUMMARY

  7. 4.3 Meiosis is a special form of cell division. III. Meiosis is a special form of cell division. gamete • A. Meiosis is necessary for sexual reproduction. egg • B. Cells divide twice during meiosis. sperm • 1. Meiosis I fertilization • 2. Meiosis II meiosis • C. Meiosis and mitosis differ in some important ways. CHAPTER RESOURCES KEY CONCEPT SUMMARY

  8. CLASSZONE.COM CHAPTER HOME Chapter Resources Image Gallery Click here to view chapter images and animations Click on the items below to access resources on Resource Centers Get more information on select science topics Audio Readings Hear chapter audio readings Content Review Review key concepts and vocabulary Standardized Test Practice Practice state standardized tests Math Tutorial Review math concepts BACK TO CHAPTER

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