Chapter 2 questions Flashcards
2.1 During the millennia in which selective breeding was practiced, why did breeders fail to uncover the principle that traits are governed by discrete units of inheritance (that is, by genes)?
2.1 Describe the characteristics of the garden pea that made it a good organism for Mendel’s analysis of the basic principles of inheritance. Evaluate how easy or difficult it would be to make a similar study of inheritance in humans by considering the same attributes you described for the pea.
2.2 An albino corn snake is crossed with a normal-colored corn snake. The offspring are all normal-colored. When these first generation progeny snakes are crossed among themselves, they produce 32 normal colored snakes and 10 albino snakes.
A. How do you know that only a single gene is responsible for the color difference in these snakes?
B. Which of these phenotypes is controlled by the dominant allele?
C. a normal-colored female snake is involved in a testcross. This cross produces 10 normal-colored and 11 albino offspring. What are the genotypes of the parents and the offspring?
2.2 Two short-haired cats mate and produce six short-haired and two long-haired kittens. What does this information suggest about how hair length is inherited?
Piebald spotting is a condition found in humans in which there are patches of skin that lack pigmentation. the condition results from the inability of pigment-producing cells to migrate properly during development. Two adults with piebald spotting have one child who has this trait and a second child with normal skin pigmentation.
A. is the piebald spotting trait dominant or recessive? Defend.
B. What are the genotypes of the parents?
