Huntington Disease and Neurofibromatosis, for example
Co-Dominance- Multiple alleles-
Environmental effects on genetics
Take a short break if you need one!
Practice Punnett Squares
Introduce Case Study #1
Let’s do some practice problems…
Overview of today’s lab
In this exercise, you will observe and record the results of the offspring produced in a dihybrid heterozygous cross of two corn phenotypes.
The corn kernel phenotypes are:
Purple & starchy (purple & nonwrinkled)
Purple & sweet (purple & wrinkled)
Yellow & starchy (yellow & nonwrinkled)
Yellow & sweet (yellow & wrinkled)
Each team will count 3 ears of corn & record the total number of each type of kernel. Don’t remove the kernels. Use pins to mark the counted rows.
Record your results & answer the questions on pp55-56.
It could be useful to work through some of the questions at the end of Ch11 (pp201-202) and the “Practice Problems” found throughout the chapter. They won’t be turned in or graded, but some questions on the exam may look similar…
Case Study #1
“ Sometimes it IS all in the Genes”
Mendelian genetics, Punnett squares
Cystic fibrosis: autosomal recessive disorder
Preparation for Lecture 8
Study today’s lecture materials (and Ch. 11 & 12), so that Lecture 8 will be more useful to you.