Blue-footed boobies have webbed feet and are comically clumsy when they walk on land. Evolutionary scientists view these feet as
A) an example of a trait that is poorly adapted.
B) the outcome of a trade-off: Webbed feet perform poorly on land but are very helpful in diving for food.
C) an example of a trait that has not evolved.
D) a curiosity that has little to teach us regarding evolution.
Answer: B) the outcome of a trade-off: Webbed feet perform poorly on land but are very helpful in diving for food.
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Megadiversity countries are those countries which
A. spend the most money on conservation. B. have the greatest number of species. C. contain the highest genetic diversity. D. have the largest number of endemic plant species. E. have the highest ecosystem diversity.
The Human Genome Project is an international effort to construct a physical map sequence of the approximately 3 billion base pairs in the haploid human genome
Indicate whether the statement is true or false
In their 1953 paper on the double-helical structure of DNA, Watson and Crick famously wrote: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material." What did they mean?
A. Sexually reproducing organisms swap their DNA. B. The sugar-phosphate backbone of DNA holds the helix together in a way that allows the genetic information to be copied. C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand. D. When a cell divides, each DNA helix is split between the daughter cells.
Which statement correctly describes human chromosomes after meiosis I?
A. The haploid number is 22. B. Human gametes end up with two of each type of 23 chromosomes. C. There are 46 chromosomes in each cell. D. Each of the 23 chromosomes contains two sister chromatids. E. Human gametes end up with one of each type of 22 chromosomes.