PPT-28N Sex-Linked Traits

SexLinked Traits Traits controlled by a gene found on the sex chromosome The Y chromosome is shorter than X therefore some genes on the X chromosome may be missing from Y Sexlinked disease is less likely to affect females because they have 2 X chromosomes. Homework #2 is due on Monday in lecture.. Change to 1b. . Do not calculate a . c. 2. value. .. Just calculate the . expected. phenotypic ratios if the genes for brown-ness and disease-resistance are actually the same gene (or completely linked). Then, say whether complete linkage is possible given the observed data.. 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. 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. 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 :. Traits can be traced through a family tree.. Pedigree Practice. In humans, albinism is a recessive trait. The disorder causes a lack of pigment in the skin and hairs, making an albino person appear very pale with white hair and pale blue eyes. This disorder also occurs in animals. The pedigrees below trace the inheritance of the allele that causes albinism.. 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. R. evised based on textbook author’s notes.. Doubly linked lists. A linked list in which each node contains a data component(s) and two links: . one pointing the next node and . one pointing to the preceding node.. 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. 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. What has gone wrong?. 2. Certain human genetic disorders can be attributed to the inheritance of single gene traits or specific chromosomal changes, such as nondisjunction.. illustrative examples:. . c/o: Aaron, Darcie, Diana, . Geeta. , Kristin, Rou-Jia. Introduction. Our “teachable unit”: Heredity module . Embedded within Introductory Biology course. Prerequisites: None (high school level biology). pg. 258 #11, 14-17, 19 Sex Linkageare controlled by genes located on either the X or Y chromosome. homologous DNA.Human Y : . 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.