Describe the process of meiosis and ova formation in a human female; start with prenatal life, and end with fertilization
What will be an ideal response?
Oogonia are produced before birth, up to the seventh month of embryonic life. Some become primary oocytes, begin meiosis, but arrest in meiosis I until puberty. Approximately one oocyte per month matures in the ovary, progressing to meiosis II. Meiosis II is completed after fertilization.
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Ectotherms often regulate their body temperatures by ____ means
Fill in the blank with the appropriate word.
The target of a site-specific recombinase consists of:
A. one short, asymmetric core sequence; two inverted-repeat binding sites; and one cleavage site. B. one short, asymmetric core sequence; two direct-repeat binding sites; and one cleavage site. C. two short, asymmetric core sequences; two inverted-repeat binding sites; and one cleavage site. D. one short, palindromic core sequence; two inverted-repeat binding sites; and one cleavage site. E. one short, palindromic core sequence; two direct-repeat binding sites; and one cleavage site.
When stimulated by the TH2 pathway, into which type of cell do B cells differentiate?
a. TH2 cells b. macrophages c. plasma cells d. eosinophils
Amniocentesis is preferred over chorionic villus sampling because recombinant DNA screening can be achieved with amniocentesis but not with chorionic villus sampling
Indicate whether the statement is true or false