Comment: WASHINGTON — Contrary to popular belief, having more children born into a family does not necessarily result in lower-IQ children, according to new research published in the June issue of the
Although IQ differences between individuals have been shown to have a large hereditary component, it does not follow that disparities in IQ between groups have a genetic basis.
But genetics can explain the wide range of possible IQs too because so many different genes are involved in developing and running a brain. It is possible, for example, to inherit all the higher IQ genes from each parent and leave the lower IQ ones behind. Now the child will be brighter than the parent.
The size of a family has a significant effect on the interrelationships among its members and can play a major role in the formation of a child's personality. Family size is a significant factor in child development, but must be considered as only one part of a larger picture, however.
Genetically, intelligence and IQ is polygenic meaning that many genes are involved in determining intelligence. As such, the correlation between parents and their children and among siblings can vary within a pretty decent range. A study from 1979 found that the correlation between sibling IQs was 0.49.
A new study shows that first-born children tend to be smarter than their siblings and second-born children are more likely to cause trouble. The University of Edinburgh study reported that the oldest child tends to have a higher IQ and thinking skills than their younger siblings.
A University of Edinburgh study shows first-born children have higher IQs and better thinking skills than their siblings. The study says that shows first-born kids get more mental stimulation than their brothers and sisters.
Smaller families tend to result in higher IQ, academic achievement, and occupational performance. Large families produce more delinquents and alcoholics. Perinatal morbidity and mortality rates are higher in large families as birth weights decrease.
The arrival of each additional child has the effect of lowering the family's intellectual environment. Thus, children from larger families grow up in a less enriched environment and tend to perform less well on measures of ability.
Empirical evidence suggests that especially parental education, parental income, and maternal IQ are important predictors of intelligence.
Like most aspects of human behavior and cognition, intelligence is a complex trait that is influenced by both genetic and environmental factors. Intelligence is challenging to study, in part because it can be defined and measured in different ways.
Being gifted runs in families. If your gifted child has brothers or sisters, there's a bigger chance that they might be gifted too. But they might not be gifted in the same way. For example, one gifted child might be advanced in music and their gifted sibling might be passionate about spiritual learning.
Just as having a high IQ doesn't ensure success, having an average or low IQ doesn't ensure failure or mediocrity. Even if you have what is considered a low IQ, you may be smart in many other ways and have many other talents and abilities that aren't reflected on a single test.
We inherit a set of 23 chromosomes from our mothers and another set of 23 from our fathers. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair, with very rare exceptions in certain disorders.
A condition is considered Y-linked if the altered gene that causes the disorder is located on the Y chromosome, one of the two sex chromosomes in each of a male's cells. Because only males have a Y chromosome, in Y-linked inheritance, a variant can only be passed from father to son.
The small family norms definition says that it is a societal expectation that families have a limited number of children. This definition of small family norms can vary depending on the culture or country in question, but it typically refers to two or three children as being the ideal size for a family.
The financial costs of maintaining a household are lower. It is easier for both parents to combine careers with family life. The general stress level is lower because there often are fewer conflicts and less rivalry.
Large family means a household of individuals related by blood or marriage or a group with five or more members, or three or more children, living together in a dwelling unit.
Another study confirms that parents with four or more children are the least stressed, especially when compared to parents with three kids. Those fears with the first child get less and less as you go along. Turns out, four is the magic number for less stress and more happiness.
Summarily, large family size has the following characteristics: It consists of father, mother, brothers, nephews, and many children. Members of the family live a subsistence life because of its size. They engage in primary activities to be able to feed the family.
Coming up with a large family definition is tricky, but many signs point to four children as the magic number. It's all in the way you read the statistics and how you feel about your own family size.
However the researchers looked at it, first-borns had, on average, an IQ of 1.5 points higher than second-born siblings, who in turn had a 1.5 higher IQ than third-borns and so on.
A 2016 study published in the Journal of Human Resources has said that firstborns are academically more intellectual and successful than other siblings because parents tend to be more invested in them.
First-borns are statistically likelier to be CEOs, Senators and astronauts—and to make more money than their younger siblings, too. That doesn't mean that the younger siblings are shut out of those careers, but it does mean that if they achieve the same high station, they will perform very differently.