2/25/2015 April 1st, 2015 Bio 1: Period 1,3, 4, 7 03/26/2015 ANNOUNCEMENTS: Prefix Test 121-160 Tomorrow Chap 6 Test Reflections  Afterschool by today at 330pm All Missing assignments for Marking Period 3 due by tomorrow at 330p Homework: Study Prefixes 121-160 A LOT OF MISSING ASSIGNMENTS!!!! On your desk: HWP, Chap 7 ISN Turn in: Late Sex-Linked Practice Packet & Labs Warmup: Study 7.1 Agenda: 7.1Quiz, 7.2 Apply EQ(s): How do complex patterns of inheritance defy Mendel’s rules?

Complex Patterns of Inheritance Page 20 EQ: How do complex patterns of inheritance defy Mendel’s rules? Section 7.2 Complex Patterns of Inheritance

Phenotype can depend on interactions of alleles Incomplete Dominance  a heterozygous phenotype is somewhere between the 2 homozygous phenotypes Neither allele is dominant The resulting phenotype is a “blend” of the original phenotypes. third phenotype in which both of the parental traits are blended

Codominance third phenotype in which both of the parental traits appear together Codominance  when both alleles of a trait are expressed completely

Many genes may interact to produce one trait Polygenic traits  traits produced by 2 or more genes Examples: eye color and skin color

Epistasis  an interaction of genes, in which the presence on one gene influences to appearance of the other

The environment interacts with genotype EPIGENETICS!!!! Remember? Lick a Rat Genes and the environment interact to determine certain traits Example: the gender of sea turtles depends on genes and the environment Turtle eggs that mature in warmer temperatures develop into female turtles Turtle eggs that mature in cooler temperatures develop into male turtles

Apply on Page 19 Complete the Apply Problems on Page 19. Incomplete Dominance Codominance 03/26/2015

Example Problem Incomplete Dominance: A plant with red flowers (RR) was mated with a plant that has white flowers (WW). Please draw a Punnett square showing incomplete dominance. Indicate the genotype and phenotype of the offspring. Genotype: RR = RW = WW = Phenotype: Red = Pink = White = R R Parents: RR x WW W

Example Problem Genotype: Phenotype: Codominance: A mother has type A blood (IAi) and the father has type O blood (ii). Please complete a Punnett square showing the genotypes and phenotypes of the offspring. IA i Genotype: Phenotype: i Parents: IAi x ii

Exit Ticket 03/26/2015