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Predicting Results of Monohybrid Crosses

Predicting Results of Monohybrid Crosses. Incomplete Dominance. Incomplete Dominance - a condition in which both alleles contribute to the phenotype of a heterozygous individual to produce a trait that is not like either parent. (Example) Snapdragons Petal color determined by

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Predicting Results of Monohybrid Crosses

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  1. Predicting Results of Monohybrid Crosses

  2. Incomplete Dominance • Incomplete Dominance- a condition in which both alleles contribute to the phenotype of a heterozygous individual to produce a trait that is not like either parent. • (Example) Snapdragons • Petal color determined by by two alleles R = red W= white • Phenotypic ratio is 1 red: 2 pink: 1 white • Genotypic ratio 1 RR: 2 RW : 1 WW

  3. Use capital initial letters for each allele (Since both alleles influence phenotype) Write alleles in alphabetical order when writing gametes or genotypes F1 generation has a phenotype that is different from that of every parent Andalusion Chickens Pure black x Pure white produces offspring that appear blue Incomplete Dominance Rules

  4. Davey Jones from Pirates of the Caribbean has strange facial growth; tentacles instead of whiskers. There are two alleles for facial growth, one that codes for curly tentacles and one that codes for straight tentacles. The heterozygous condition produces wavy tentacles. Davey Jones has wavy tentacles and his wife has curly ones, what are the possible genotypic and phenotypic ratios of their offspring?

  5. Lop-eared rabbits have 2 alleles for ear length, one codes for long ears (10 inches) and the other for short ears (4 inches). The heterozygous condition produces a rabbit with medium ears (7 inches). What is the genotypic ratio of a cross between a long eared rabbit and a medium eared rabbit? What is the phenotypic ratio?

  6. In cats the absence of a long tail allele results in a manx cat. The presence of a tail allele results in a long tail cat. A cat with both alleles is short tailed. What would be the genotypic & phenotypic ratios of the possible offspring if you cross two short tail cats?

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