District Genetics – Brown eyes are dominant over blue eyes
Collin County Community College District Genetics Questions
activity on Genetics,
1. Brown eyes are dominant over blue eyes. What will be the phenotypic ratio among the offspring from a cross between two heterozygous parents?
2. The ability to taste phenythiocarbamide (PTC) is dependent upon a dominant gene, A. The recessive allele, a, is associated with the inability to taste the substance. Two parents, both tasters, have a non-taster offspring. What are the genotypes of the two parents? Show the cross and F1 generation.
3. Trait Dominant Recessive Plant Height Tall (T) Short (t) Pod Shape Smooth (B) Wrinkled (b) a. For each of the following genotype, predict the phenotype: (2 pts) TtBB: _____________________; ttBb: _______________________ b. Heterozygous plant that is tall and with smooth pod is crossed with a homozygous plant that is short and with wrinkled pod. What are the phenotype ratios of the offspring?
4. In humans, polydactylism (having an extra finger on each hand) is dominant to the typical 5-finger arrangement. Tongue rolling is dominant to not being able to roll one’s tongue. A man who is homozygous for 5-fingers and who cannot roll their tongue has children with a woman who is heterozygous for polydactylism and tongue rolling. Set up the cross with genetic symbols and then draw a Punnett square to show the genotype of the offsprings.
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