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Sex linked trait in humans

Human Handedness Is An Ancient Trait New evidence shows that right-handed dominance is age-old, and that handedness might not even originate in the brain. Recent research has shown that handedness and language do not, er, go hand in hand, at least in the way we once thought. Marianocecowski via wikimedia Much of what defines us as a species is all in our heads. Nine out of 10 humans are considered right-handed.
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Sexual dimorphism

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Sex-linked traits (video) | Sex linkage | Khan Academy

A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation for example, the large muscles of a weightlifter. Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment. Also used to describe the process of genetic change within a population, as influenced by natural selection. A graph of the average fitness of a population in relation to the frequencies of genotypes in it. Peaks on the landscape correspond to genotypic frequencies at which the average fitness is high, valleys to genotypic frequencies at which the average fitness is low. Also called a fitness surface. A behavior has adaptive logic if it tends to increase the number of offspring that an individual contributes to the next and following generations.
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Right or Left: Human Handedness Is An Ancient Trait

Certain human diseases result from mutations in the genetic complement genome contained in the deoxyribonucleic acid DNA of chromosomes. A gene is a discrete linear sequence of nucleotide bases molecular units of the DNA that codes for, or directs, the synthesis of a… Classes of genetic disease Most human genetic defects can be categorized as resulting from either chromosomal, single-gene Mendelian, single-gene non-Mendelian, or multifactorial causes. Each of these categories is discussed briefly below. Diseases caused by chromosomal aberrations About 1 out of live newborns has a detectable chromosomal abnormality.
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And it's not an obvious answer, because throughout the animal kingdom, it's actually determined in different ways. In some creatures, especially some types of reptiles, it's environmental. Not all reptiles, but certain cases of it. It could be maybe the temperature in which the embryo develops will dictate whether it turns into a male or female or other environmental factors.
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