Cystic Firbrosis is a homozygous recessive condition. A genetic counselor should advise concerned parents that, if each of them has a parent who has cystic fibrosis yet neither of the concerned parents is affected, the probability of their potential child having cystic fibrosis is
a) 0%
b) 25 %
c) 50%
d) 100%
Ans: b) 25 %
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The movement of genetic material between organisms by any mechanism other than descent is known as ____
a. lateral gene substitution b. polyphyly c. hybridization
d. cloning e. horizontal gene transfer
Humans are _______.
a. Australopithecus b. Homo erectus c. Ardipithecus d. Homo sapiens e. Homo habilis
DNA consists of two antiparallel strands of nucleotides held together by
A. hydrogen bonds. B. ionic bonds. C. covalent bonds. D. peptide bonds.
Pacific salmon hatch in streams and grow out in the Pacific Ocean. At the end of their life, they mate once then die
Assuming that not all salmon survive life in the ocean and that those who do survive produce equal numbers of offspring, this would be an example of _______ selection. Fill in the blank with the appropriate word.