PPT-Pedigrees and Sex linked Traits

Part 4 What is a PEDIGREE A chart used to trace traits throughout a family Parts of the chart Circle females Squares males Halffilled inDotted carrier Have the gene but do not show signs of it. Humans have 46 chromosomes in every cell.. 2 of these chromosomes make us male or female.. Female: XX Male: XY. The Sex Chromosomes:. Has information for male traits.. Few other genes.. The Y chromosome. Essential Question: . How are dominant and recessive sex-linked traits passed onto offspring?. Sex-linked traits are determined by genes on sex-chromosomes.. Most. sex-linked alleles (genes) are carried on the X chromosome. . 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. How traits are passed down . Warm Up 3/20/12. Read the scenario below and create a . punnet. square based on the information given.. Andy and Amy just got married. Andy has brown hair with a genotype of Bb. Amy is a blond with the genotype of bb.. Complex Inheritance Patterns:. Autosomal v. X-Linked. Pedigree. Family Tree. Genealogy. Inheritance . Diagram. Relates . parents and offspring for numerous generations. Shows relationships between parents, children, grandchildren…. Contents:. Introduction to sex linked inheritance.. Chromosome carries which type of genes?. Three types of traits. Characteristics of sex linkage.. Types of sex linkage.. Sex linked disorders.. Sex linked inheritance :. Analyzing family trees for patterns of inheritance. Interpreting Pedigrees. What is a pedigree?. How can we look for patterns to determine inheritance of traits?. Pedigrees. Pedigrees are genetic family trees.. Human Genetics. . Thomas Hunt Morgan. – (early 1900’s). - Worked with Drosophila (fruit flies).. - Discovered sex chromosomes (X and Y)…Y is shorter than X in length.. - Females = XX Males = XY. A visual representation of how a trait is inherited . through generations. . . Earliest. generations are at the . top. .. Each row is . one generation. . . Circle. = female, . Square. = male. Dark shading . pg. 258 #11, 14-17, 19 Sex Linkageare controlled by genes located on either the X or Y chromosome. homologous DNA.Human Y : Sex determined by . genes. found on the . X. and . Y. chromosome. Females: . egg. produced with an . X. chromosome. Males: . ½. sperm cells contain . X. ; and the other . ½. contain . Y. There is a . Which gender (male or female) is most likely to have sex-linked traits? . How many X chromosomes do males have? . How many X chromosomes do females have? . Why does a single X chromosome that carries the allele for red-green colorblindness cause males to be color blind but . . Sex determination. Sex chromosome is determined at . fertilization time. .. Early stage fetus contains two . ducts system. :. Wolfian. (male).. Mullerian. (female).. Sexual difference starts in the . SEX LINKED INHERITANCE. SEX LINKED INHERITANCE. . X LINKED . INHERITANCE . INHERITANCE. COLOUR BLINDNESS. X LINKED INHERITANCE. Y . LINKED INHERTANCE. HYPERTRICHOSIS. Y LINKED INHERITANCE.