Unit 7 Non-Mendelian Genetics
Non-Mendelian Genetics deals with inherited traits that are more complex than a single gene that exhibits a simple pattern of dominance. There are five types of Non-Mendelian traits we will study:
sex-linked traits (carried on the sex chromosomes)
Multiple alleles ( 3 alleles for blood type for example)
Incomplete dominance (the heterozygous phenotype is a blend)
Co-dominance (AB blood type exhibits co-dominance)
Polygenic traits (most traits are controlled by 2 or more genes)
Take this practice quiz (added 3/15): https://www.biologycorner.com/quiz/qz_advanced_genetics.html
Great practice quiz! https://www.quia.com/quiz/435724.html
Another decent quiz minus a typo and #6 is being scored incorrectly. http://www.softschools.com/quizzes/biology/genetics/quiz2433.html
Here is a great resource to read more about Non-Mendelian genetics: http://www.ck12.org/biology/Non-Mendelian-Inheritance/lesson/Non-Mendelian-Inheritance-BIO/?referrer=concept_details
LEARNING OBJECTiVES:
Define an allele and give examples.
Describe what it means for a gene to have Multiple Alleles and give an example, including a genotype; state which traits studied in class are an example of this.
Explain the inheritance of and environment's influence on polygenic traits. Give an example of one and write an example genotype for a trait. Identify a graph to show the distribution of these phenotypes in a population (like we did for human height).
Correctly identify patterns of inheritance that are sex-linked traits (using pedigrees); identify at least 2 different traits that are sex-linked discussed in class and in the textbook. (Any trait that is not sex-linked is called autosomal)
Use the tool of a family pedigree to predict genotypes and phenotypes. (Make observations of family pedigrees ( i.e. only males have the trait or 1 person has the trait but his parents do not) and be able to fill in the genotypes for each person.)
Predict the genotypic & phenotypic ratios from crosses using Co-dominant and Incomplete Dominant traits.
Non-mendelian Genetics Assignments to review:
Royal family pedigree - intro to Sex-linked traits
Sex-linked crosses -
Non-Mendelian Textbook assignment
Incomplete and Co-dominance Practice WS
Read about blood typing in your textbook p. 344-346 (some had trouble with this)
Applied Genetics (pedigree practice)
Can you explain everything in this picture?
Can you explain the inheritance of sex-linked traits?
WATCH THIS FOR AN OVERVIEW OF NON-MENDELIAN GENETICS: