The origin of a new plant species by hybridization, coupled with accidents during nuclear division, is an example of

#Question id: 9213

#Unit 9. Diversity of Life Forms

Suppose you attend a town meeting at which some experts tell the audience that they have performed a cost-benefit analysis of a proposed transit system that would probably reduce overall air pollution and fossil fuel consumption. The analysis, however, reveals that ticket prices will not cover the cost of operating the system when fuel, wages, and equipment are taken into account. As a biologist, you know that if ecosystem services had been included in the analysis, the experts might have arrived at a different answer. Why are ecosystem services rarely included in economic analyses?

#Question id: 28316

#Unit 5. Developmental Biology

Equatorial region in the mammalian fertilization sperm is___

#Question id: 19042

#Unit 13. Methods in Biology

#Question id: 5538

#Unit 5. Developmental Biology

The first truly vertebrate phase of development is manifested by the formation of the

#Question id: 5295

#Unit 8. Inheritance Biology

A cross is made between an Hfr that is met+ thi+ pur+ and an F-that is met- thi- pur-. Interrupted mating studies show that met+ enters the recipient last, so met+ recombinants are selected on a medium containing supplements that satisfy only the pur and thi requirements.  These recombinants are tested for the presence of the thi+ and pur+ alleles. The following numbers of individuals are found for each genotype:

What is the following correct combination?