Biology is designed for multi-semester biology courses for science majors. It is …
Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.
By the end of this section, you will be able to:Describe how …
By the end of this section, you will be able to:Describe how a karyogram is createdExplain how nondisjunction leads to disorders in chromosome numberCompare disorders caused by aneuploidyDescribe how errors in chromosome structure occur through inversions and translocations
From something as small and complex as a chromosome to something as …
From something as small and complex as a chromosome to something as seemingly simple as the weather, sex determination systems vary significantly across the animal kingdom. Biologist and teacher Aaron Reedy shows us the amazing differences between species when it comes to determination of gender.
This resource is a video abstract of a research paper created by …
This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:
"A recent study provides a first glimpse into the evolution of the unusual sex-determination system in brown algae. Sex chromosomes – the tightly wound bundles of DNA responsible, in many species, for determining the sex of an organism – have arisen independently many times across the tree of life. While the molecular and evolutionary dynamics of these genomic regions are well understood in some organisms, very little is known about sex chromosomes in other groups such as brown algae. The brown algae are a large group of mostly marine multicellular organisms, and include many seaweeds. They are distantly related to plants and animals – separated by over a billion years of evolutionary time. The mode of sex determination can be quite different between groups of organisms. In humans for example, males possess both an X and a Y chromosome. Females: two X’s. In most brown algae, sex is determined during part of the life-cycle in which there is only one copy of each chromosome..."
The rest of the transcript, along with a link to the research itself, is available on the resource itself.
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