Which of the following statements is true?
a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits.
b. Homologous chromosomes differ in banding patterns, the traits they code for and size.
c. While sex chromosomes determine different genders they look the same until they are stained.
d. In humans all 46 chromosomes have an identical match called the homologue.
Ans: a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits.
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The material in the gray crescent of a frog embryo is necessary for normal development
a. True b. False
Answer the following statement true (T) or false (F)
Linkage between a gene of interest and a DNA marker is being studied. A mating results in 19 parental and 1 recombinant offspring. The results of this mating are sufficient to conclude with confidence that the gene of interest and the DNA marker are linked.
Myasthenia gravis disease arises from the production of autoantibodies against
A. sodium pump proteins in the cell membrane. B. acetylcholine receptors on skeletal muscle. C. myelin sheath cells of the nervous system. D. cells in thyroid follicles. E. acetylcholine receptors on smooth muscle.
The multi-level grouping of individual organisms is a means of
A. classification. B. identification. C. reduction. D. minimization.