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Concerning events during the periods of life how dissimilar is the gametogenesis in women and in men?
The formation of spermatogonia in men takes place during the embryonic period. The formation of sperm cells though is a continuous process that begins in puberty and goes on until old age and sometimes during all the remaining life of the man.
In women all oogonia are formed before birth. The oogonia turn into oocytes I that enter the first division of meiosis (meiosis I). This division though is interrupted at prophase and continues only in puberty. After the beginning of menses an egg cell is released during every period and, if fecundated, it finishes the meiotic division. The oogenesis stops after menopause (cessation of the menstrual activity) and the climacteric period of life starts.
Which of the following best explains the difference among dominant and recessive alleles? A. The recessive allele encodes a protein with normal activity whereas the dominant al
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