1. Pea plants are tall if they have the genotype TT or Tt, and they are short if they have the genotype tt. A tall plant is mated with a short plant. Half the offspring are tall, and half are short. What is the genotype of the tall plant? Explain your answer.
2. A = big apples; R = red apples; a = small apples; r = yellow apples. You have one tree that produces big yellow apples and another tree that produces small red apples. When the two are crossed, you find that half the offspring trees produce big red apples and half produce big yellow apples. What are the genotypes of the parents? Explain your answer.
Part 1. ??Choose ONE of these 2 genetics problems and provide an answer with explanation. [Later, be sure to review your classmates answers to both.] ??

a. ABO Blood Type Problem. A woman is married for the second time. Her first husband was blood type A and her child by that marriage was type O. Her new husband is type B, and their child is type AB. What is the woman’s ABO genotype and blood type? Explain your answers.??

b. X-linked Inheritance Problem. Colorblindness is X-linked and recessive. Blondie is normal and not a carrier, but her husband Dagwood is colorblind. Is their daughter Cookie colorblind? Is their son Alexander colorblind? If Cookie marries a colorblind man, what genotypes can she expect in her sons & daughters? Explain your answers. ??

Part 2. ??In 1999, scientists discovered a woolly mammoth that had been frozen in glacial ice for the past 20,000 years. They thawed it very carefully so they could use its DNA to clone a wooly mammoth. It turns out that there wasn’t enough material to work with. But they plan to try again the next time a frozen woolly mammoth comes along. ??

Write a short paragraph on the pros and another short paragraph on the cons of cloning an extinct animal. This may be a response to a classmate’s entry if you discuss both pros & cons. Additional responses to classmates’ ideas are welcome. [There is some information on cloning in Chapter 11, p. 207-210.]