Three human disorders–fragile-X syndrome, myotonic dystrophy, and Huntington disease–are conceptually linked by a common mode of molecular upset. Describe the phenomena that link these disorders
What will be an ideal response?
All three are caused by disparate genes, but each gene was found to contain repeats of a unique trinucleotide sequence. In addition, the number of repeats may increase in each subsequent generation (genetic anticipation).
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Negatively charged subatomic particles that have almost no mass are called:
A. protons. B. ions. C. electrons. D. polymers. E. neutrons.
Which of these describes the type of reproduction that is most adaptive in a rapidly changing environment with many different parasitic diseases present?
A) asexual reproduction because the currently successful genotypes can reproduce quickly B) asexual reproduction, because asexual reproduction uses less energy, which leaves more for each individual to adapt to the changing environment C) sexual reproduction because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment D) sexual reproduction because this type of reproduction allows the production of a greater number of offspring thus providing more individuals to take advantage of any environmental challenges presented
To understand the role of zinc in plant growth and development, you are growing a tomato plant using hydroponics. Which plant organs do you expect to have developmental defects if you provide the plant with a solution devoid of zinc?
A) below ground development B) stem development only C) all organs will be affected D) leaf development only E) above ground development
When an organism has two different alleles at a gene locus, it is referred to as _____.
a. homozygous recessive b. homozygous dominant c. heterozygous