Exam 2: Genetics and Prenatal Development

You are out to dinner with your friend,who is in her second trimester of pregnancy.You order a beer and she proceeds to order a glass of wine.When you raise a concern about alcohol being dangerous for the developing fetus,she replies,"My doctor told me it was okay to have a glass of wine once in a while." What is your evaluation of this advice?

What theory argued that for conception to occur,both the man and the woman had to emit a "seed" and that the "seed" was only released through orgasm?

How much weight should a woman gain during pregnancy (provide an approximate range)? Provide one diet or exercise recommendation.

Which prenatal period is considered a critical period when teratogens are most likely to have severe and enduring effects? Why?

For a recessive gene to be expressed in the phenotype,it must be paired with a ____.

By the end of the fourth week,the embryo's head is apparent and the eyes,nose,mouth,and ears begin to form.How long is the embryo at this point?

The embryonic period lasts from the ____ to the ____.

By the end of the first week following conception,the fertilized egg now has approximately 100 cells and is known as the _____.

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?

Of the following,which best describes the Y chromosome?

The totality of an individual's genes is referred to as his or her ____.

At the conclusion of meiosis,how may ova have been formed?

Iron-rich foods such as beef,duck,potatoes,spinach,and dried fruits are important in what way for the pregnant mother and fetus? These foods help to ____.

Your friend just had her first pregnancy check-up and is just starting her second month of pregnancy.She is very upset that she was not given the chance to hear her fetus's heartbeat.Remembering what you learned in developmental class,what should you tell her?

If having more than five fingers occurs because of a dominant gene,what needs to happen for a person to have more than five fingers?

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

If a fetus has the sex chromosomes XX,its genotype is ____.

Where do 95% of all HIV infections take place?

Why would some couples seek genetic counseling before attempting a pregnancy?

What prenatal technique can be used to examine the status of the fetus by taking samples of the cells that are beginning to form the umbilical cord?