Heredity – Part 2 Chapter 10 Section 10.3 Biology: Exploring Life Sally Stratton

10.3 Inheritance Pattern Variations Co-dominance Multiple alleles Polygenic inheritance Nature vs. Nurture

Review 10.3 If a cow can be red (rr), black (RR), or roan (Rr), what inheritance variation does it exemplify? Hair color is dependant on a combination of many genes. What type of inheritance variation is it?

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show?

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete (Co-dominance)

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete (Co-dominance) B. What are the genotypes for long? round? oval?

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete (Co-dominance) B. What are the genotypes for long? RR round? rr oval? Rr

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete (Co-dominance) B. What are the genotypes for long? RR round? rr oval? Rr C. What would you expect from a cross between two long radishes?

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete B. What are the genotypes for long? RR round? rr oval? Rr C. What would you expect from a cross between two long radishes? All Long radishes RR RR x RR = R R R RR RR

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete B. What are the genotypes for long? RR round? rr oval? Rr C. What would you expect from a cross between two long radishes? All Long radishes RR D. From a cross between two round radishes?

Incomplete Dominance Problem 1 In radishes, the shape may be long (RR), round (rr), or oval (Rr). Cross between long and oval radishes gave 161 long and 159 oval. Crosses between oval and round gave 204 oval and 200 round. Crosses between oval and oval gave 120 long, and 245 oval, and 113 round. A. What inheritance pattern do these ratios show? Incomplete B. What are the genotypes for long? RR round? rr oval? Rr C. What would you expect from a cross between two long radishes? All Long radishes RR D. From a cross between two round radishes? All round radishes rr rr x rr = r r r rr rr

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross?

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross? Key RR = red, rr = white Rr = pink

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross? Key RR = red, rr = white Rr = pink Parents = RR x Rr

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross? Key RR = red, rr = white Rr = pink Parents = RR x Rr R R Punnett R r

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross? Key RR = red, rr = white Rr = pink Parents = RR x Rr R R Punnett R RR RR r Rr Rr

Incomplete Dominance Problem 2 In four-o’ clocks, the allele from red flowers is incompletely dominant to the allele for white flowers. The heterozygous is pink. A gardener crosses a red four-o’ clock with a pink four-o’ clock. What are the expected genotypic and phenotypic ratios from this cross? Key RR = red, rr = white Rr = pink Parents = RR x Rr R R Punnett R RR RR Genotypic 2:2:0 Pheno 2:2:0 r Rr Rr

Multiple Alleles Human Blood Types Genotype Phenotype AA, Ao A Blood BB, Bo B Blood AB AB Blood oo O blood

Multiple Alleles Problem 1 Cross a man with type A blood with a woman with type B heterozygous blood. What are the possible genotypes and phenotypes of their offspring?

Multiple Alleles Problem 1 Cross a man with type A blood with a woman with type B heterozygous blood. What are the possible genotypes and phenotypes of their offspring? Man = AA or Ao Woman Bo

Multiple Alleles Problem 1 Cross a man with type A blood with a woman with type B heterozygous blood. What are the possible genotypes and phenotypes of their offspring? Man = AA or Ao Woman Bo Punnett A A A o B B o o

Multiple Alleles Problem 1 Cross a man with type A blood with a woman with type B heterozygous blood. What are the possible genotypes and phenotypes of their offspring? Man = AA or Ao Woman Bo Punnett A A A o B AB AB B AB Bo o Ao Ao o Ao oo

Multiple Alleles Problem 1 Cross a man with type A blood with a woman with type B heterozygous blood. What are the possible genotypes and phenotypes of their offspring? Man = AA or Ao Woman Bo Punnett A A A o B AB AB B AB Bo o Ao Ao o Ao oo Genotypes: AB, Ao, Bo, oo Phenotypes: AB,A,B,O