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This study, however, did not control for differences in body size or age. [84] [85] Later studies have shown that while male's brains are an average of 10-15% larger and heavier than female's brains, there is relatively no difference when controlling for body weight. This means the brain-to-body mass ratio is, on average, approximately the same ...
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote. [3]
Presence of this gene starts off the process of virilization. This and other factors result in the sex differences in humans. [9] The cells in females, with two X chromosomes, undergo X-inactivation, in which one of the two X chromosomes is inactivated. The inactivated X chromosome remains within a cell as a Barr body.
A transgene is a gene that has been transferred naturally, or by any of a number of genetic engineering techniques, from one organism to another. The introduction of a transgene, in a process known as transgenesis, has the potential to change the phenotype of an organism.
A post on Instagram implies that because former First Lady Michelle Obama used In vitro fertilization (IVF) to get pregnant, that means she is actually transgender. Verdict: False Michelle Obama ...
Cisgenesis (etymology: cis = same side; and genesis = origin) is one term for organisms that have been engineered using a process in which genes are artificially transferred between organisms that could otherwise be conventionally bred. [2] [3] Genes are only transferred between closely related organisms. [4]
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