Exam 22:Human Development and Genetics-Part B

During the _______________ stage of labor,the placenta is delivered.

A pair of chromosomes that has maternal and paternal genes for the same traits is a(n)___________________ pair.

The embryonic membrane that forms the fetal part of the placenta is the ___________________.

A person's genotype for a particular trait refers to the __________________________________.

The embryonic membrane that contains fluid to cushion the embryo is the _________________.

After birth,the baby's ductus arteriosus ______________________,which allows more blood to flow to the ___________________,which increases _____________________ circulation.

The function of the placental hormone hCG is to maintain the _______________________ during early pregnancy.

During the _______________ stage of labor,the amniotic sac ruptures.

Just before birth,all of the fetus's organ systems are functioning except the ________________________ system.

During an average gestation period,the period of embryonic growth lasts __________ weeks and the period of fetal growth lasts _____________ weeks.

The sex chromosomes in women are called ____________ and in men are called ____________.

For people,curly hair is dominant and straight hair is recessive. Genetics problem: Mom is heterozygous for curly hair and Dad has straight hair.The percent chance that a child of theirs will have straight hair is ______________.

During pregnancy,an important function of progesterone is to inhibit contractions of the __________________________ of the uterus.

During labor,the hormone that causes strong contractions of the uterus is ___________________.

The sex chromosomes in women are called _______________.

When a zygote undergoes cleavage,the process of cell division is _____________________.

The expression of the genes a person has for a particular trait is called the ____________________.

In order for a dominant trait to appear in a person's phenotype,the person must have _______________ gene(s)for it.

A person who is homozygous for a particular trait has two ____________________ genes for it.

In later pregnancy,the placenta secretes the hormones _________________________ and ____________________________.