Bellwork: Mon. Jan. 11, 2016 1. Show a cross between two heterozygous guinea pigs. What % of the offspring will have short hair? ________ What %of the.

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Today’s Objectives TSW employ the four primary rules for solving genetics problems. TSW successfully solve genetics crosses involving one and two alleles.

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Bellwork: Mon. Jan. 11, Show a cross between two heterozygous guinea pigs. What % of the offspring will have short hair? ________ What %of the offspring will have long hair? _______ 2. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. What are the probable genotypes of the parents? ________ x ___________ Short hair is dominant: SS… Ss long hair is recessive: ss

How to Set up a Dihybrid Cross And Punnett square

Traits: Curly Hair (A) Straight Hair (a) Brown Hair (B) Blonde Hair (b)

Do this : AaBb X AAbb Genotypic Ratio: Phenotypic Ratio How to Set up a Dihybrid Cross Curly Hair (A) Straight Hair (a) Brown Hair (B) Blonde Hair (b)

Curly Hair (C) Straight Hair (c) Brown Hair (B) Blonde Hair (b) Hair Color, Texture Cross Cross a female with homozygouscurly, heterozygous brown hair to a male with, straight blonde hair: 1 st, write the cross: ________ x ________ Genotypic Ratio: Phenotypic ratio:

Bellwork: Tues. Jan. 12, White coat color (WW) is co-dominant to red coat color in cattle (RR). What should the genotypes and phenotypes be for parental cattle if a farmer wants only cattle with roan coats. Cross:____________________ Genotype(s): Phenotype(s) 2. A florist has flowers that exhibit incomplete dominance. Red petals are incompletely dominant to white petals. What would the genotype(s) and phenotype(s) be for offspring of a red flower and a white flower? Cross:____________________ Genotype(s): Phenotype(s):