Two generations ago, men in the United States were expected to initiate dates and women to select wedding gifts. This BEST illustrates aspects of gender .

Explanation:

Gender role is the concept of believing that certain duties and roles are based on the gender of the individual. It is a social role of the two sexes, i.e.,male and female. Gender role is the traditional notion of doing one's duty that best suits their gender.

For instance, a man expected to earn and women expected to look after kids at home is the most common notion about gender roles. It is a societal and cultural development. Many scholars and sociologist have, however, established that gender roles are not hereditary but are elements of ethno-culture influence. It means that gender roles are constructed according to the cultural heritage of a particular society.

Here, two generations ago, men would have been expected to initiate dates and other progressive developments because men were believed to be more bold and advancing. Other the other hand, women were expected to select wedding gifts because they were perceived to be more good at picking the right things and better shoppers.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.