Louisiana State University

BIOL 1201

Chapter 14

1)In his breeding experiments, Mendel first crossed true-breeding plants to produce a second generation, which were then allowed to self-pollinate to generate the offspring. How do we name these three generations?

 

 

2. Which of the following is true about a plant with the genotype AABbcc?

3. What is an allele?

 

 

 

4. Consider pea plants with the genotypes GgTt and ggtt. These plants can each produce how many type(s) of gametes?

 

 

 

5. Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the offspring will have the same genotype as the parents?

 

 

 

 

6. You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one. All of the F₁ are pink. What does this say about the parental traits?

 

 

 

7. Height in humans generally shows a normal (bell-shaped) distribution. What type of

inheritance most likely determines height?

 

 

8. Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disorder. Which statement below must be true?

 

 

9. Various procedures can be used to detect genetic disorders before birth. Among the tests discussed in this chapter, which is the least invasive (list first), and which two allow the chromosomes of the fetus to be examined?

 

 

10. Which of the following do you expect if an individual is heterozygous for the sickle cell trait?

 

 

11. Which of the following differentiates between independent assortment and segregation?

 

 

12. Mendel accounted for the observation that traits which had disappeared in the F₁ generation reappeared in the F₂ generation by proposing that