1. No Bell Work today! Set up the next page in your journal… Page: 44 Date: 12-8-15 Title: Genetics – Incomplete Dominance Essential Question: How can I predict genetic outcomes of non-Mendelian traits?

2. Remember! What we’ve done so far is called MENDELIAN GENETICS. There is one dominant trait and one recessive trait – no in-between! Today we’ll look at something that follows a different rule…

3. Incomplete Dominance: when the genotype is heterozygous, the phenotype is a blend (ex. red + white = pink) Note: Sometimes, we write this by using an abbreviation of the trait in a capital letter (C =color) and the alleles as a superscript (C R = red flower) or subscript (C R ).

5. 1. In a plant, long stems are dominant (S L ) to short stems (S S ). The heterozygous genotype will produce medium stems. If a long stemmed plant and a short stemmed plant are crossed, what are the expected phenotypes of their offspring? SLSL SLSL S S SLSSSLSS SLSSSLSS SLSSSLSS SLSSSLSS S L S L = Long S L S S = Medium S S S S = Short DAD = S L S L MOM = S S S S 100% medium stems

6. Spongebob loves growing flowers for his gal pal, Sandy. She loves the Poofkin flowers—red, purple, and blue! Interestingly enough, the Poofkin flowers display incomplete dominance in their genes for color. 1. Using “C R ” for red and “C B ” for blue, what would be the genotypes for the following phenotypes? red: ______ purple: _____blue: _____ 2. Complete a Punnett square to cross a red Poofkin and a purple Poofkin. What are the expected phenotypes of their offspring? CRCRCRCR CRCBCRCB CBCBCBCB CRCR CRCR CRCR CBCB CRCRCRCR CRCRCRCR CRCBCRCB CRCBCRCB 50% red 50% purple

7. Coat color in mice is incompletely dominant. Yellow and white-colored mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring? CYCY CWCW CYCY CWCW CYCYCYCY CYCWCYCW CYCWCYCW CWCWCWCW C Y C Y = yellow C Y C W = cream C W C W = white DAD = C Y C W MOM = C Y C W 1 yellow : 2 cream : 1 white

8. For the rest of today… Work on the Incomplete Dominance Practice Problems. Anything you don’t finish in class is HOMEWORK!!