If men can't nurse, then why do they have nipples? The answer has less to do with evolution and more to do with your personal development as a teeny tiny embryo. Short version: We're all girls -- at least at first. Hank explains!
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I study fetal development and discover all humans start with female bodies, rudimentary vagina and uterus, and when testicles start to produce testosterone is when the vagina close to male genitals.
Male hormones just cross out -lactation- genes and only left dry nipples, until males take female hormones and lactation start functioning again.
Idiot, you need your tailbone it is not vestigial. It is not useless. Your tailbone has 9 muscles attached to them, without your tailbone you cannot do some pretty important things. If you really think it is vestigial, I will pay to have yours removed!
Don't enforce darwinism with lies!
Quick genetics lesson. Cited from "Essentials of genetics 9th edition." Author William s. Klung. Page 88 first paragraph continued from page 87. "During early development, every human embryo undergoes a period when it is potentially hermaphroditic. By the fifth week of gestation, gonadal primordia (the tissue that will form the gonad) arise as a pair of gonadal (genital) ridges associated with each embryonic kidney. the embryo is potentially hermaphroditic at this stage it's gonadal phenotype is sexually indifferent-male or female reproductive structures cannot be distinguished, and the gonadal ridge tissue can develop to form male or female gonads. primordial germ cells migrate to these ridges, where an outer cortex and inner medulla form (outer and inner parts of an organ). The cortex is then able to develop into an ovary, while the medulla may develop into a testis. In addition, two sets of undifferentiated ducts called the wolffian and mullerian ducts exist in each embryonic. wolffian ducts differentiate into other organs of the male reproductive tract, while mullerian ducts differentiate into structures of the female reproductive tract." Now for a quick summary on what causes the male or female reproductive structures to be expressed. basically, it comes down to the SRY gene, this is located on the Y chromosome and at the seventh week the gene express itself and development of the medulla into a testis starts. If there is no Sry gene then the Mullerian ducts form the fallopian tubes, uterus, cervix and so on. many organs of the male and female anatomy are homologous in that they derived from the same structures. examples: The penis and clit are formed from the same basic structure, ovaries and testis you see the trend. like so people can see (never thought I'd say that lol..)
Put simply, the default form is female. It is only when one leg of one X chromosome is discarded that we get a male. I suppose that if we want to make a politically correct statement about us males we would say that males are genetically challenged. LOL. Funny, but true. I know this will make some guys heads explode. Then again, maybe not. Guys like that won't watch this video or stay awake in science class. Now that right there, that's what's really funny.
Sure! It was thought that there is an evolutionary trend that the Y chromosome is losing genes and becoming smaller. Some scientists found that perhaps the Y chromosome was as big as the X chromosome and that it was losing genes over time. They speculated that the Y chromosome may entirely degrade over time (hence extinction of males). A better explanation is that the Y chromosome is losing unnecessary function and its not likely to ever lose its critical function (that is passing down maleness). Therefore, men will be the long time companion of women for some time longer.
Brian Koehler, thanks for clarification. I was trying to keep it short (no pun intended) and sweet. It's been a few years since I've studied genetics. Fact is, my last read on the subject (probably 20 yrs. ago? the months fly by like days at my age) was Bryan Sykes, Adam's Curse, which brings me back to your comment about serious consequences for the male of our species. If I remember correctly, Sykes said, basically, that he didn't expect to see males survive the females of the species. (The end is near for us. We're going the way of the whiptail lizard apparently.) He gave us about 125k years at best. Can you elaborate briefly on that?
That's not quite true. The Y chromosome isn't just an X chromosome without a leg. If it were, that would be called deletion and it would have serious consequences. The Y chromosome is actually quite different than the X chromosome but are the only two dissimilar chromosomes that pair up during meiosis. The Y chromosome carries some copies of genes that are on the X chromosome as well as genes responsible for gender. It is true that the Y chromosome is much shorter and contains far fewer genes than the X chromosome, but it is still a complete chromosome.
When Doctor Who talks about how Weeping Angels exist because of quantum mechanical ideals, they are not totally BSing. Recently I made a theory about why Weeping Angels freeze when observed due to quantum reasons.
No, human embryos do not start off as female. ¬.¬
From a genetic perspective, they are always either male or female, as determined by the chromosomes, and from a phenotypical perspective they are genderless!
OH NO... the attack helicopter gendered people and the crazed feminists/ etc.. will have a field day with this video... your being "SO INSENSITIVE!" HOW DARE YOU say that there is ONLY 2 genders! (lololol)
We have nipples becouse long before birth everyone was female. Then others evolved further and grew up while some were stuck as females.
OAAAAAHHH shots fired!
Look chaps, don´t take this too seriouselly, women and men invidually are no superior to each other, it is together when we are perfect. No need for men vs female argument, both are needed.
Marin Community Foundation and Asian Americans/Pacific Islanders in Philanthropy.
Overall, US-born Muslims make up the largest percentage at 34% of all Muslims in the Bay Area, followed by 14% born in Pakistan, 11% in Afghanistan, 10% in India, 3% in Egypt and 2% each in Iran, Jordan, Palestine and Yemen.
Silicon Valley Pakistani-American by the Numbers:
There are 35,000 Pakistani-born Muslims in San Francisco Bay Area, or 14% of the 250,000 Muslims who call the Bay Area home, according to the study. Bay Area Muslim community constitutes 3.5 percent of the area’s total population and is one of the highest concentrations of Muslims in the country.
As of 2013, South Asian Muslims, including Pakistanis, have the highest income levels, with nearly half (49%) of them having a household income above $100,000. In comparison, those groups with the lowest proportion of household incomes above $100,000 were Hispanic Muslims (15%), Afghans (10%), and African American Muslims (10%).
The Bay Area Muslim community is very diverse in terms of race and ethnicity:
South Asians (30%)
African Americans (9%)
Asian/Pacific Islanders (7%)
Based on the survey findings, the majority of Muslims live in the following three counties:
and Contra Costa (12%)
Thousands of Pakistan-born techies are working at Apple, Cisco, Google, Intel, Oracle and hundreds of other high-tech companies from small start-ups to large Fortune 500 corporations. Pakistani-Americans are contributing to what Erik Brynjolfsson and Andrew McAfee describe as "The Second Machine Age" in a recent book with the same title.