Although researchers are not certain what causes seasonal affective disorder,they suspect that it has something to do with the hormone melatonin. excessive melatonin release during winter in people with SAD may account for their.drowsiness or depression
Melatonin is the hormone that is thought to act as a sleep trigger and is associated with regulating circadian rhythms. It is also linked to seasonal affective disorder (SAD) as lower levels of sunlight can lead to decreased melatonin production, potentially contributing to mood changes in some individuals.
The question reminds me of the expression, "Absence makes the heart grow fonder". Polar countries (away from the equator) have less sunlight during winter and this creates seasonal affective disorder, a feeling of depression. People in different countries have different cultures which is linked to psychology obliquely. Generally, these are separate topics.
a sex-linked, or X-linked disorder
An x linked disorder that causes malformattion of the skull is
A sex-linked disorder is when a mutation of genes overrides the normal function of a another gene. For example, male-pattern baldness is a sex-linked disorder.
X Linked
Women can carry or have a sex linked (x-linked) genetic disorder. Males cannot be carriers, they either have the disorder or they don't: this is because the male has only one X chromosome.
it means that you inherit this form of disorder either from your mother or father's sex chromosomes. For example- color blindness or Haemophillia.
There are so many genetic disorder caused by sex linked to name few; Auto Immune disorder, Hemophilia, Night Blindness etc.
Muscular dystrophy is a sex-linked recessive disorder.
It is an X-linked recessive disorder.
Hemophilia