sex-determination XYY normal! Men have nipples? On autosome, sweat/sebaceous glands.
X and Y HOMOLOGOUS -> cross-over & recombine. How many copies of a gene? 4.
Meiosis, crossing over, and the SRY gene: XX males and XY females (HHMI) Everything You Never Knew About Sex 10:50 "Why do men have nipples?" Birds ZW chromosomes.
ectotherm Our ancestors are fish: Sperm need to SWIM; plants pollen tube! Embryo in WATER!
Life in Cold Blood 37:45-41:25 Marsupial Frog. Most fish spawn without touching! Sponges spawn without mating rituals Male Alpine Newt courts female with sperm packet (6:00) Surinam toad exhibits maternal care Tettigoniidae ~ Katydids: females eat spermatophore
homeotherm BBC-Galapagos/#2:07:45 storm-petrel; Blue-footed Booby ritual; Nazca sibling rivalry; 40:20 Waved Albatross mating Great Zebra Exodus: parental care of young
bird_organs guano=uric acid. Turkeys have phallus
sperm Centrioles form spindle for 1st zygote division.
male_organs Labeling exercise:
epididymis left 2.
Seminal vesicles 60% of semen, RECTUM prostate into urethra, bulbourethral clear mucus: neutralize acidic urine.
Vas deferens starts inside like other vertebrates; mammals descend and drag vas deferens (10") down.
PSA test: Specific Antigens for cancer - not recommend
spermatogenesis Sertoli: hormones. Germinal called germ-line in ch09.
female_organs Clitoris above urethra, homologous to penis. FSH/LH -> follicle -> corpus luteum
oogenesis 2M primary oocytes prophase I @ birth. 300-400 ovulated/life; Corpus luteum secretes progesterone. Calico cat and X inactivation: random deactivation of an X chromosome
Calico=halloween orange/black/white can be XXY
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7epost 1=F copulation=internal 2=several hundred million sperm 3=two million, four hundred (12/year * 30+ years)