Chapter 3 Flashcards
what does intersex mean?
individuals who the biological components of sex (chromosomes, hormones, and internal and external genitalia) do not consistently fit either the typical male pattern or the typical female pattern
what was the earliest method for checking for sex?
looking at genitalia
what does sex testing look like now?
look at genitals (normally stops here)
examine the individuals pattern of sex hormones by drawing blood
examine the individuals testosterone levels
what does optimal sex refer to?
the binary sex that doctors and parents perceive as the best option for a newborn whose genitalia appear atypical at birth
how WERE intersex infants socialized according to optimal sex policy?
they should be socialized as either boys or girls beginning in the first 18 months of life (corrective surgery, hormone treatment)
what do doctors now recommend when people have intersex kids?
that they postpone unnecessary surgeries and hormone treatments until children are old enough to understand their situation and consent to treatment
John Money assumed that nurture is stronger than nature in determining individuals gender identity, what is the problem with this?
he argued that children born with weird genitals should be raised as either a male or female
ex. twin bothers were born, one of them had a botched circumcision, followed John Moneys approach and reassigned bruce as female, John Money claimed that bruce developed a typical female gender identity and adjusted well, but really bruce (raised as brenda) was struggling and ended up killing himself because he felt like a boy
what are heritability estimates?
a statistic that specifies the proportion of total population variance in a given trait that is due to genetic differences among the people in the population. can range from 0 (genetic differences among people account for none of the population variance in a trait) to 100 (genetic differences among people account for all of the population variance in a trait
how do women lower their testosterone to normal levels?
by taking hormone suppressing drugs that have unknown side effects
what is nature and nurture?
nature: biological factors such as genes, chromosomes and hormones
nurture: social and cultural factors such as environments, life experiences and socialization
is it nature and nurture or nature vs nurture?
nature and nurture. this is because they both shape sex and gender in powerful ways and we see an increasing consensus that nature and nurture jointly shape sex and gender
what are genes?
the basic units of heredity passed down from parents to offspring that carry the instructions for shaping the offsprings characteristics
what is a gene by environment interaction?
when a genetic effect on a trait (frizzy hair) or behavior occurs only under certain environmental circumstances (humidity) (or when the environmental effect on a trait or behavior depends on a persons genetic makeup)
nature influences nurture
how might gene by environment interactions be passive?
parents create certain rearing environments that cannot be separated from their own (and thus their childs) genetic makeup
ex. parents who are genetically skilled at reading and who both pass along reading skills to their children genetically and create reading- rich environments for them
how might gene by environment interactions be active?
an individuals genetic tendency guides her to choose certain environments
ex. a genetically shy person who deliberately chooses quieter environments than her more extroverted sibling chooses
example of how nurture can influence nature?
ex. when girls experience environments of higher family stress they tend to have an earlier age of menstruation
what is the biopsychosocial model’s view on nature/ nurture?
rejects nature/ nurture and argues that biology (genes and hormones) and environment (culture and learning experiences) mutually influence each other in shaping sex differences and similarities in various cognitive abilities
what is epigenetics?
the study of the biological mechanisms that guide whether or not certain genes get expressed or activated
supports nature and nurturew
what is an epigenetic mark?
molecular structure that sit on genes and instructs them to activate or deactivate
can be influenced by the environment (in the uterus or after birth)
how do epigenetic marks explain why identical twins who are exact genetic copies of each other differ?
because epigenetic marks may activate different genes in the cells of identical twins
because epigenetic marks can be transmitted from mother to offspring (ex. mothers stress levels during pregnancy) may affect not only her own epigenetic environment but her offspring which may alter which genes will be expressed in her offspring (illustrates complex interaction of nature and nurture)
what is an example of how gender- linked behavior can influence peoples genes?
men drink alcohol more frequently and excessively than women, this can alter epigenetic factors and produce changes in the brain DNA
what is the microbiome?
the complex system of microbial microorganisms that lives inside the human body and communicates with the brain along the gut- brain axis
what is the gut brain axis?
bidirectional communications that take place between the brain and the gastrointestinal tract
might sex differences in the composition of the microbiome account for psychological sex differences?
evidence indicates that the health and diversity of the microbiome can influence anxiety and depression
what is sex differentiation?
the complex series of processes that unfolds as the sex- undifferentiated embryo transitions into an individual with male, female or intersex gonads and genitalia
what initiates the process of sex differentiation?
sex chromosomes (allosome)
males have XY
females have XX
which parent determines the sex of the child?
male
what is a chromosome?
the organized units of genes inside the cells of all living organisms. somatic cells (blood cells) in the human body have 23 pairs of chromosomes and reproductive cells have 23 unpaired chromosomes
what are the gonads?
(ovaries and testes) are sex organs that produce sex cells (egg and sperm) and sex hormones (estrogen and testosterone) until week 6 of pregnancy the gonads of female and male human embryos do not differ by sex
what occurs around the 6th week of pregnancy?
Y (SRY gene) initiates the development of the male gonads (testes) and in the absence of Y (SRY gene) the ovaries develop