PPT-KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

Two copies of each autosomal gene affect phenotype Mendel studied autosomal gene traits like hair texture Mendel s rules of inheritance apply to autosomal genetic disorders A heterozygote for a recessive disorder is a carrier . 5. th. Grade - Timber Ridge Elementary. Genes are found on tiny spaghetti-like structures called chromosomes . and . chromosomes are found inside . the cell nucleus.. In humans, a cell nucleus contains 46 individual chromosomes or 23 pairs of chromosomes (chromosomes come in pairs, remember? 23 x 2 = 46). Half of these chromosomes come from one parent and half come from the other parent.. Learned Behavior. A behavior that has changed because of a certain experience.. What are some behaviors we learn?. Let’s list some. not to fight with sibling (irritates adults), watch less TV so I can get school work finished,turn in work because of loss of recess,go to bed early so not tired in morning. Humans have approximately . 20,000 – 30,000. genes that code for traits. . However, only have . 46 chromosomes. . Thus each chromosome must have . many genes. on them. . Often seen in . Sex-Linked Traits. Chapter . 7 Extending . Mendelian. Genetics . Section 7-1 Chromosomes and Phenotype. KEY CONCEPT . The chromosomes on which genes are located can affect the expression of traits.. MAIN IDEAS . • Two copies of each . We can PREDICT Traits!. Review: Observe the Family Below and list some observable TRAITS. What traits seem to have been passed down?. Traits Review. Some traits are inherited. Similar to the traits your parents have. The Chromosome Theory of Heredity. Mutations. Regulation of Gene Expression. Objectives. State the chromosome theory of heredity. Explain how gene linkage affects inherited traits. Describe the process of crossing-over and explain how it increases genetic variety. Overview of Genetics. Genetics – Overview. Genetics is the study of heredity and variation . Genetics is the unifying discipline in biology. Explains why organisms have certain traits . How traits are passed from parent to offspring. Kyle . Stutts. . Sam . houston. state . university. Sex-Linked Characteristics. Objectives. Students will be able to:. Comprehend how inheritance plays a role in sex-linked genes. Explain the difference between sex- linked, limited, and influenced inheritance. Chapter 19, lesson 3 . objective:predict. the consequences of refusal skills in various situations. Words to know. Heredity: the passing of traits from parents to their children. chromosomes: threadlike structures found within the nucleus. A regular human cell has 46 chromosomes: 44 autosomes, which come in pairs, and 2 sex chromosomes, which specify gender (XX for female and XY for male).. The pairs of autosomes are called "homologous chromosomes." One of each pair came from mom and the other came from dad. Homologous chromosomes have all of the same genes arranged in the same order, but with slight differences in the DNA sequences of the genes.. Biologists study Genetics to find out what controls we can have on disease and traits that are passed on though the generations.. Traits. are the characteristics that may be passed on some may be visible and others may be not or difficult to see. . Introduction . The human genome consists of at least 20,000 genes on 23 pairs of chromosomes. Of these pairs, 22 are autosomes, and the other pair consists of sex chromosomes (X, Y). Linked genes are located on the same chromosome; sex-linked genes are located on a sex chromosome. The frequency of crossing-over between genes is used to construct linkage maps, which show the locations of genes on chromosomes.. As there are more genes than chromosomes, it can be expected that each chromosome contains more than one gene.. The genes for different characters may be either situated on the same chromosome or on different chromosome.. TRAITS. . Passed from parent to offspring. Why do not all offspring with the same parent look the same?. THE GENES on THE CHROMOSOMES. TRAITS : What are they good for?. Chromosomes are structures in the .