Which of the following examples is best explained by the process of convergent evolution?
A. The wings of birds and butterflies being used for flight.
B. Wolves and coyotes both producing milk for their young.
C. Both mice and rats having a tail.
D. A human cell and a fruit fly cell both going through the process of transcription and translation in order to produce a gene.
Answer: A
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Why are systemic fungal infections seen only in a subset of the population, even though most people contact fungi and fungal spores in soil and dust all of the time?
Contrast the epidemiology of systemic fungal infections with giardiasis, which infects virtually everyone that comes in contact with the pathogen. What will be an ideal response?
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. Although fertility is reduced in both sexes, females have higher fertility rates than males. Van Dyke et al
(1995; Down Syndrome Research and Practice 3[2]:65—69 ) summarize data involving children born of Down syndrome individuals. Assume that children are born to a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome? A) Two-thirds of the offspring would be expected to have Down syndrome. B) One-third of the offspring would be expected to have Down syndrome. C) All the children would be expected to have Down syndrome. D) None of the offspring would be expected to have Down syndrome. E) One-half of the offspring would be expected to have Down syndrome.
In mature compact bone, osteocytes become isolated from one another by the extracellular matrix, making it impossible for them to communicate with each other
Indicate whether the statement is true or false
True or False: DNA can be repaired WITHOUT the use of a template
a. TRUE b. FALSE