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: