DNA and Biodiversity

The development of DNA and genetic analysis has opened up a whole new branch of biological investigation: molecular phylogeny. DNA analysis has been used to reclassify a great number of organisms. These ultra-sensitive techniques have been able to reveal previously imperceptible relationships between both living and extinct organisms. Visit the Paleo-DNA Laboratory to learn a little bit more about DNA analysis. Examine the Biodiversity Services section to answer the following questions. Why are wildlife biologists increasingly turning to DNA analysis for examining issues of biodiversity? What are some of the implications of finding a low genetic diversity among a species? Why would this info... click for more

Transcription of DNA

Discuss transcription, including such things as the location in the cell, transcription signals, products, chemical details, and/or the amount of chromosome involved.

What is the histone code?

What is meant by the "histone code"? Describe the parts of histones involved, the variations, and their general purpose.

DIHYBRID CROSSES WITH INCOMPLETE DOMINANCE

DIHYBRID CROSSES WITH INCOMPLETE DOMINANCE In cattle, polled is dominant to horned, and roan is the result of the heterozygous condition of the genes for red and white. What proportion of the offspring of a red, heterozygous polled bull and a roan, horned cow would be expected to be roan and horned? 25% SEX LINKAGE 1. In humans color blindness is due to a sex-linked recessive allele. Two persons with normal vision produce a color-blind child. What are the genotypes of the parents? What is the sex of the child? Answer - Father is XCY, mother is XCXc. Boy child. 2. If a trait is always transmitted directly from a father to all his sons and from those sons to all thei... click for more

Gene frequency calculation based on percentage of population that is homozygous for recessive trait

If 9% of an African population is born with a severe form of sickle-cell anemia (ss), what percentage of the population will be more resistant to malaria because they are heterozygous (Ss) for the sickle-cell gene?