There are a number of environmental theories suggesting that childhood experiences contribute to the cause of same-sex sexual attraction. The textbook concludes that
a. No matter how hard researchers have looked, theyve found no childhood events or activities that are reliably related to later bisexual, lesbian or gay attractions in adults.
b. A good deal of evidence points to several early childhood events that may contribute to becoming gay, but not to becoming bisexual or lesbian.
c. Several recent studies point to indications that early childhood experiences may contribute to one becoming lesbian, but not bisexual or gay.
d. There is a good deal of sound, recent research that points to several childhood factors that likely contribute to gay, lesbian, and bisexual development.
Question 2
All of the following are pieces of evidence that support the maternal immune hypothesis as a part of the cause of same-sex attraction in males EXCEPT
a. Anti-H-Y antibodies in utero have been shown to disrupt brain development, but not physical development.
b. H-Y antigens cannot cross the blood-brain barrier, thus increasing their concentration in the fetal brain.
c. Cytology research shows that the maternal immune response is greater to cells from male than female children.
d. Newborn boys with older brothers tend to have a lower birth weight than boys with older sisters.
Any number of crossovers gives 50 percent recombinants
Coral growth rings as an indicator of environmental change
An Environmental Kuznets Curve
Number of Chromosomes in Selected Organisms
Chromosome Number in Selected Animal Species
Meiosis Halves the Chromosome Number