Exam 2: Genetics and Prenatal Development

What are the first 2 weeks after fertilization referred to as?

What are two consequences of a folic acid deficiency?

One of the consequences of having a sex chromosomal disorder is that it might disrupt development of the reproductive system at puberty.What can be done about the difficulty at puberty?

Low iodine intake during pregnancy increases the risks of miscarriage,stillbirth,and abnormalities in fetal brain development.As a result,what has been done since the 1920s in developed countries?

What does viability mean,and how likely is a fetus to be viable at 22 weeks? At 26 weeks? Why would this vary depending upon whether a person lives in a developed or a developing country? What is the main obstacle to viability even by the beginning of the third trimester?

The outer layer of cells that will form the structures that will provide protection and nourishment for the newly formed organism is the ____.

An infant born with facial deformities,heart problems,misshapen limbs,and a variety of cognitive problems,such as mental retardation,has characteristics of which of the following?

The human body contains how many chromosomes?

____ is the process in which sperm is injected directly into the uterus,and is the simplest and most effective reproductive treatment.

Epigenesis suggests ______.

The concept of reaction range proposes that ____ establish(es)boundaries,whereas ____ determines where a person falls within that range.

Avoiding _______ is a common treatment for phenylketonuria (PKU).

According to the text,why does the ovum have an excessive amount of cytoplasm?

Fragile X syndrome is the most common genetic disorder associated with ______.

Latasha and Brett are having their first child and are concerned that their child may have Down syndrome because Latasha is over 40 years old.Which of the following would most likely be used to help Latasha and Brett through this process?

What are the major teratogens during the fetal period?

Individuals who have what chromosomal disorder are more likely to develop leukemia,cancer,Alzheimer's disease,or heart disease at earlier ages than usual (in their thirties and forties)?

Although often viewed as the stronger sex,explain why males are actually more vulnerable.

Depending on the drug,what percentage of multiple births results from using fertility drugs?

What percentage of their genes do dizygotic twins have in common?