unit 4: plant reproduction lesson 10: dominant and recessive genes colorado agriscience curriculum
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Unit 4: Plant Unit 4: Plant Reproduction Lesson Reproduction Lesson 10: Dominant and 10: Dominant and Recessive Genes Recessive Genes
Colorado Agriscience Colorado Agriscience CurriculumCurriculum
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 22
I. Monohybrid CrossesI. Monohybrid Crosses
A. Three class genotypesA. Three class genotypes– 1. Homozygous Dominant = BB1. Homozygous Dominant = BB– 2. Homozygous Recessive = bb2. Homozygous Recessive = bb– 3. Heterozygous = Bb3. Heterozygous = Bb
B. B = Black & b = RedB. B = Black & b = Red C. Six possible crosses: C. Six possible crosses:
BB x BB, BB x Bb, BB x bb, Bb x Bb, BB x BB, BB x Bb, BB x bb, Bb x Bb, Bb x bb, bb x bb Bb x bb, bb x bb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 33
I. Predicting Ratio’sI. Predicting Ratio’s
Homozygous x Homozygous x Homozygous Homozygous
A. GenotypeA. Genotype– 2. Results in a 2. Results in a
homozygous homozygous dominant zygotedominant zygote
B. BB x BBB. BB x BB– Phenotype:Phenotype:– 1. Each parent can 1. Each parent can
only contribute a only contribute a dominant genedominant gene
BB BB
BB BBBB BBBB
BB BBBB BBBB
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 44
I. Predicting RatiosI. Predicting Ratios
B. Homozygous x B. Homozygous x HomozygousHomozygous
. bb x bb . bb x bb - All will be red All will be red
Genotypic RatioGenotypic Ratio– 4bb : 04bb : 0
Phenotypic RatioPhenotypic Ratio– 4 red coats : 0 4 red coats : 0
black coatsblack coats
b b b b
b b bbbb bbbb
b b bbbb bbbb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 55
I. Six Fundamentals I. Six Fundamentals Types of MatingTypes of Mating Homozygous x Homozygous x
HomozygousHomozygous F. BB x bbF. BB x bb
– Genotypic ratio: Genotypic ratio: 0BB : 4Bb0BB : 4Bb All offspring will All offspring will
be heterozygousbe heterozygous
– Phenotypic ratio: Phenotypic ratio: 4 black coat : 0 4 black coat : 0 red coatred coat
BB BB
bb BbBb BbBb
b b BbBb BbBb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 66
II. Predicting RatiosII. Predicting RatiosHomozymous x Homozymous x
HeterozygousHeterozygous E. BB x BbE. BB x Bb
– 1. Genotypic 1. Genotypic RatioRatio
2 BB : 2 Bb 2 BB : 2 Bb
– 2. Phenotypic 2. Phenotypic RatioRatio
a) 4 Black colora) 4 Black color
BB BB
BB BBBB BBBB
bb BbBb BbBb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 77
III. Predicting Ratio’sIII. Predicting Ratio’s
G. Bb x BbG. Bb x Bb– 1. Phenotypic 1. Phenotypic
RatioRatio a) 3 black to 1 red a) 3 black to 1 red
or 3:1or 3:1
– 2. Genotypic 2. Genotypic RatioRatio
a) 1BB: 2Bb: 1bb a) 1BB: 2Bb: 1bb
BB b b
BB BBBB BbBb
b b BbBb bbbb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 88
IV. Predicting RatioIV. Predicting Ratio
H. Bb x bbH. Bb x bb– 1. Genotypic 1. Genotypic
RatioRatio a) 2Bb: 2bb a) 2Bb: 2bb
– 2. Phenotypic 2. Phenotypic RatioRatio
a) 2 black to 2 reda) 2 black to 2 red
bb bb
BB BbBb BbBb
bb bbbb bbbb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 99
II. Multiple Gene Pairs II. Multiple Gene Pairs
A. MatingA. Mating– 1. B = Black & b = Red1. B = Black & b = Red– 2. P = Polled & p = polled 2. P = Polled & p = polled
B. BullB. Bull– 1. BbPp1. BbPp
C. CowC. Cow– 1. BbPp1. BbPp
D. What will the phenotypic & D. What will the phenotypic & genotypic ratios be? genotypic ratios be?
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 1010
II. Multiple Gene PairsII. Multiple Gene Pairs
PBPB PbPb pBpB pb pb
PBPB PPBBPPBB PPBbPPBb PpBBPpBB PpBbPpBb
Pb Pb PPBbPPBb PPbbPPbb PpBbPpBb PpbbPpbb
pB pB PpBBPpBB PpBbPpBb ppBBppBB ppBbppBb
pb pb PpBbPpBb PpbbPpbb ppBbppBb ppbb ppbb
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 1111
II. Multiple Gene PairsII. Multiple Gene Pairs
E. Genotypic RatioE. Genotypic Ratio– 1. 1 PPBB: 2 PPBb: 1 PPbb: 2 PpBB: 1. 1 PPBB: 2 PPBb: 1 PPbb: 2 PpBB:
4 PpBb: 2 Ppbb: 2 ppBb: 1ppbb 4 PpBb: 2 Ppbb: 2 ppBb: 1ppbb F. PhenotypeF. Phenotype
– 1. 9 polled and black1. 9 polled and black– 2. 3 polled and red2. 3 polled and red– 3. 3 horned and black3. 3 horned and black– 4. 1 horned and red 4. 1 horned and red
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 1212
Worksheet 1 Worksheet 1
BB bb
BB
BB
BB BB
BB
b b
BB BB
b b
bb
BB bb
BB
b b
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 1313
Worksheet 2Worksheet 2
BB bb
b b
b b
b b b b
bb
b b
Unit 4, Lesson 10 Dominant and RecessiveUnit 4, Lesson 10 Dominant and Recessive PP PP 1414
Worksheet 3Worksheet 3
PBPB PbPb pBpB pb pb
PBPB
PbPb
pB pB
pb pb