Define the following terms: – Homozygous – Dominant – Law of segregation – Monohybrid cross – F1 generation – Test cross Who was Mendel and what did he contribute to genetics? What are the possible genotypes and phenotypes of the offspring of two parents who have AB and O blood types? State the principle of independent assortment.

In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not located on the same chromosome. Calculate the genotypic and phenotypic ratios of the results of the following crosses: – TTss x TtSS – Ttss x ttss Oompah Loompas generally have blue faces, which is caused by a dominant gene. The recessive condition results in an orange face. – Otis Oompah has an orange face and is married to Ona Oompah who has a blue face. They have 60 children, 31 of them have orange faces. What are the genotypes of the parents?

Tay-Sach’s disease is carried on the autosomes and is recessive. Normal is dominant. A heterozygous man and woman are married. What is their chance of having a child with the condition? In a certain plant, both purple x purple and purple x blue yield purple and blue colored offspring, but blue x blue gives rise to only blue. – Which gene is dominant? – What does this tell you about the genotypes of blue – and purple-flowered plants?

Certain breeds of cattle show incomplete dominance in coat color. When pure breeding red cows are bred with pure breeding white cows, the offspring are roan (a pinkish coat color). Summarize the genotypes & phenotypes of the possible offspring when a roan cow is mated with a roan bull. A man with type AB blood marries a woman with type B blood. Her mother has type O blood. List the expected phenotype & genotype frequencies of their children.

What is a pedigree and what is it used for? What does the chromosomal theory of inheritance state? What is the difference between traits that are autosomal and sex-linked? Give an example of an autosomal recessive and a sex-linked recessive disorder. Compare and contrast incomplete dominance and codominance.