CHAPTER 30 REPRODUCTION AND DOMESTICATION OF FLOWERING PLANTS
Scientific Skills Exercise
Teaching objective: This exercise is designed to give students practice in applying the concept
of negative versus positive correlations in interpreting data.
Teaching tips: A version of this Scientific Skills Exercise can be assigned in MasteringBiology.
Although most students understand the concept of positive correlation, some think that a
students who have this misconception. It also helps identify students who are adept at passively
understanding the results of studies discussed in class but who lack experience in grasping the
significance of data sets.
Answers:
1. (a) The number of seeds per flower and the number of visits per flower are positively
2. (a) M. rupestris and M. eastwoodiae appear to be primarily asexual reproducers because they
Suggested Answers for End-of-Chapter Essay Questions
See the general information on grading short-answer essays and the suggested rubric at the
beginning of this document.
11. Scientific Inquiry
As the chief scientific advisor, I would reassure critics that GM foods, including canola, cotton,
12. Science, Technology, and Society
Traditional breeding manipulates the genetic makeup of organisms indirectly, by selecting for
variants in existing populations, crossbreeding closely related species, and identifying and
13. Focus on Evolution
As a result of their size, small populations have significant challenges in avoiding extinction. The
14. Focus on Organization
Sample key points:
Emergent properties in structures are those that are not obvious unless a structure is looked at
in its entirety.
Petals attract animal pollinators.
Sample top-scoring answer:
well exemplified by a flower. The petals, by means of their bright colors and scents, attract
15. Synthesize Your Knowledge
A pollen grain is the haploid male gametophyte of a seed plant, along with a surrounding spore
wall. A pollen grain develops from haploid microspores by the process of mitosis and at maturity
consists of two cells, the generative cell and the tube cell. The function of a pollen grain is to