L33 Psych 321 Lecture Notes - Lecture 2: Y Chromosome, Spermatogonium, Chromosome Abnormality
7 Dec 2020
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Genetic bases of development: the biology of heredity: need a sperm to fertilize the ovum (egg, natural fertilization vs in vitro fertilization, surrogate, mitochondria have different dna in them (mitochondrial dna). At the end of the first replication phase (during the metaphase 1 of meiotic division), just before division, each pair undergoes a swapping or. After the crossing over, the primary oocyte turns into the secondary oocyte (large) and the first polar body (small). Finally, when the sperm breaks through the outer cell of the secondary oocyte, it becomes an ovum, and only after the sperm is in, does one set of 23 chromosomes get ejected (second polar body). The combination of a pair of chromosomes can take are aa, 50% chance of ach and 50% of no ach. If you inherit one copy from your mother (hh) and none from father (hh), then. If you inherit one copy from both parents (hh), then 25% chance of escaping disease.
