Exam 21: Human Development and Genetics

The early embryonic stage that is a hollow sphere of cells with an inner cell mass is the ____________________.

During the second stage of labor,____________________.

The umbilical arteries carry blood from the ____________________ to the ____________________.

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

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

The human ____________________ has ____________________ chromosomes and is formed by the union of egg and sperm.

The genetic code in cells is the ____ of the ____.

The portion of the blastocyst that secretes enzymes to permit implantation is the:

During the ____________________ stage of labor,the baby is delivered.

After birth,the fetal foramen ovale is ____ in order to ____ pulmonary circulation.

During gestation,the first 8 weeks are considered the ____________________ growth period.

After birth,the baby's ____________________ constricts,which prevents blood from flowing into the aorta and thereby allows more blood to flow to the ____________________.

The umbilical vein carries blood from the ____________________ to the ____________________.

Sex-linked traits are considered ____________________ because a woman must have ____________________ gene(s)for them to express such traits.

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

The stage of labor during which the placenta is delivered is the:

The embryonic membrane that has villi to provide nourishment for the early embryo is the:

The site of exchanges between maternal blood and fetal blood is the ____________________.

Blood is carried from the placenta to the fetus by the ____________________,and this blood has high levels of the gas ____________________.

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 ____________________.