This web site provides a number of karyotypes of human cells including normal male and female and trisomy 21. (
http://worms.zoology.wisc.edu/zooweb/Phelps/karyotype.html
)
This web site would help students visualize the process of mitosis in onion root-tip cells. (
http://staff.jccc.net/pdecell/celldivision/oniontip.html#nterphase
)
This web site would help students visualize the process of mitosis in onion root-tip cells. It shows slides of onion root-tip cells at
various magnifications. (
http://www.biosci.ohio-state.edu/~plantbio/osu_pcmb/courses/pb101/pb101_microscopic_pics_...
)
This interactive tutorial will help reinforce mitosis is whitefish embryo cells. (
http://www.jburroughs.org/science/resources/mitosis/printanimaldiagram.html
)
Study Guide: Chromosome Linkage, Mapping, and Crossing-Over (
http://www.personal.psu.edu/faculty/w/x/wxm15/Online/Classical%20Genetics/lectures/linkag...
)
This web site provides detailed information as well as providing animations on mitosis. It includes information on the cell cycle, the
phases of mitosis, and DNA replication. (
http://www.cancerquest.org/printfriendly.cfm?printsec=11
)
This provides notes plus links to several animations and movies dealing with meiosis. (
http://www.people.virginia.edu/~rjh9u/IntroBio/bio201/lectures/Lecture23.html
)
Great images of human karyotypes, idiograms, chromosomes, and banding. (
http://www.pathology.washington.edu/galleries/Cytogallery/main.php?file=human%20karyotypes
)
An interactive animation with detailed explanations of each step of cell meiosis. (
http://www.cellsalive.com/meiosis.htm
)
Page 575 Some species of reptiles, amphibians, and fish are able to reproduce naturally by parthenogenesis. As well, biologists can induce parthenogenesis in some species, including some mammals. What new fields of research have opened up as a result of research on parthenogenesis? Which field do you think is the most interesting?
How would parthenogenesis provide a source of embryonic stem cells? Does this represent a solution to the ethical dilemma surrounding the
use of embryonic stem cells? This article from New Scientist provides a starting point to consider these questions. (
http://www.newscientist.com/article.ns?id=dn3654
)
The opinions expressed by this writer for the pose important questions about the use and implications of
biotechnology. (
http://www.cbhd.org/resources/stemcells/jones_2003-06-02_print
)