Modern Genetics Table of Contents Human Inheritance Human

Modern Genetics Table of Contents Human Inheritance Human Genetic Disorders Advances in Genetics

Modern Genetics - Human Inheritance of Blood Type Blood type is determined by a single gene with three alleles. This chart shows which combinations of alleles result in each blood type.

Modern Genetics - Human Inheritance The Sex Chromosomes The sex chromosomes carry genes that determine whether a person is male or female. They also carry genes that determine other traits.

Modern Genetics - Human Inheritance Colorblindness Punnett Square Red-green colorblindness is a sex-linked trait. A girl who receives only one recessive allele (written Xc) for red-green colorblindness will not have the trait. However, a boy who receives one recessive allele will be colorblind.

Modern Genetics - Human Inheritance Identifying Main Ideas As you read the section “Patterns of Human Inheritance, ” write the main idea in a graphic organizer. Then write three supporting details that further explain the main idea. Main Idea Human traits are controlled by single genes with two alleles, single genes with multiple alleles, and multiple genes. Detail Human traits controlled by single genes with two alleles have two distinctly different phenotypes. Though a single gene can have multiple alleles, a person carry only two of these alleles. Multiple genes that control a trait act together to produce a single trait with a large number of phenotypes.

Modern Genetics - Human Inheritance Links on Genetics Click the Sci. Links button for links on genetics.

Modern Genetics End of Section: Human Inheritance

Modern Genetics - Human Genetic Disorders A Pedigree A pedigree is a chart or “family tree” that tracks which members of a family have a particular trait.

Modern Genetics - Human Genetic Disorders A Hemophilia Pedigree The pedigree shows the inheritance of hemophilia, a sexlinked disorder in a family.

Modern Genetics - Human Genetic Disorders Pedigree Activity Click the Active Art button to open a browser window and access Active Art about pedigrees.

Modern Genetics - Human Genetic Disorders Comparing and Contrasting As you read, compare and contrast the types of genetic disorders by completing a table like the one below. Disorder Cystic fibrosis Sickle-cell disease Description Body produces abnormally thick mucus. Red blood cells are sickle -shaped and have reduced ability to hold oxygen. Cause Recessive allele due to removal of three DNA bases Codominant allele Hemophilia Blood clots slowly or not at all. Recessive allele on X chromosome Down Syndrome Mental retardation and heart defects An extra copy of chromosome 21

Modern Genetics - Human Genetic Disorders Sickle-Cell Disease Click the Video button to watch a movie about sickle-cell disease.

Modern Genetics End of Section: Human Genetic Disorders

Modern Genetics - Advances in Genetics Changing Rice Production The graph shows how worldwide rice production changed between 1965 and 2000. New, hybrid varieties of rice plants are one factor that has affected the amount of rice produced.

Modern Genetics - Advances in Genetics Changing Rice Production Reading Graphs: According to the graph, how did rice production change between 1965 and 2000? Rice production increased.

Modern Genetics - Advances in Genetics Changing Rice Production Reading Graphs: How many metric tons of rice per hectare were produced in 1965? How many were produced in 2000? 2 in 1965; 4 in 2000

Modern Genetics - Advances in Genetics Changing Rice Production Calculating: Calculate the approximate difference between rice production in 1965 and 2000. 2 metric tons/hectare

Modern Genetics - Advances in Genetics Changing Rice Production Developing Hypotheses: What factors besides new varieties of plants might help account for the difference in rice production between 1965 and 2000? Possible answer: fertilizers and improved harvesting methods

Modern Genetics - Advances in Genetics Genetic Engineering Scientists use genetic engineering to create bacterial cells that produce important human proteins such as insulin.

Modern Genetics - Advances in Genetics Asking Questions Before you read, preview the red headings. In a graphic organizer like the one below, ask a question for each heading. As you read, write answers to your questions. Questions What is selective breeding? Answers Selective breeding is the process of selecting organisms with desired traits to be parents of the next generation. Why are organisms cloned? To produce offspring with desired traits What is genetic engineering? A process in which genes from one organism are transferred into the DNA of another organism What advance has helped us learn about human genetics? The Human Genome Project

Modern Genetics - Advances in Genetics Links on Genetic Engineering Click the Sci. Links button for links on genetic engineering.

Modern Genetics - Advances in Genetics Selective Breeding Click the Video button to watch a movie about selective breeding.

Modern Genetics End of Section: Advances in Genetics

Modern Genetics Graphic Organizer Human traits controlled by Single genes Multiple alleles Many genes Sex-linked genes such as Widow's peak Blood type Height Colorblindness

Modern Genetics End of Section: Graphic Organizer