Practice Problems for Bio 1:
1) Short hair is dominant over long hair in dogs. If ashort-haired dog whose mother was long-haired is crossed with along-haired dog, what proportion of the offspring will beshort-haired?
2) The common grackle is a species of robin-sized blackbirdsthat are fairly common over most of the United States. Suppose thatlong tails (L) were dominant to short tails in these birds. Afemale short-tailed grackle mates with a male long-tailed gracklewho had one parent with a long tail and one parent with a shorttail. What is the male's genotype? What is the genotypic ratio?
2) A man with type O blood has a sister with type AB blood. Whatare the genotypes and phenotypes of their parents?
3) The inheritance of curly hair illustrates incompletedominance. When a curly haired individual reproduces with astraight-haired one, the children all have wavy hair. Whatoffspring would be produced, in what proportions, when two peoplewith wavy hair reproduce?
4) Colorblindness is an X-linked trait recessive disorder. Awoman who does not carry the color-blindness allele has childrenwith a man who is color blind. What proportion of their childrenwill be color blind?
5) Huntington disease (HD) is an autosomal dominant disorder. Aperson who is heterozygous for the Huntington disease allele hasoffspring with someone who does not have HD. What proportion oftheir children will have HD?
