Exam 21: Human Development and Genetics

The genes a person has for a particular trait are called the ____________________.

The hormone hCG is produced by the ____________________ of the embryo, and its effects are on the ____________________ in the ovary.

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

For the ABO blood types in people, the ____________________ allele is recessive and the ____________________ alleles are co-dominant.

For people, curly hair is dominant and straight hair is recessive. Genetics problem: Mom has straight hair and Dad is homozygous for curly hair. The chance that their child will have straight hair is:

The yolk sac is the embryonic membrane that forms the first ____________________.

After birth, the foramen ovale in the baby's ____________________ is ____________________, which helps increase ____________________ circulation.

For the embryo, the chorion:

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.

During the second stage of labor, ____________________.

The sex chromosomes in women are called:

A human cell contains how many pairs of autosomes?

If a trait may appear in the phenotype when only one gene for it is present, that trait is called:

The umbilical arteries contain blood that has a high level of:

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

For people, red hair is a recessive trait. In order for a child to have red hair, what must be true of the parents?

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

The early embryonic stage that is a solid sphere of cells is the ____________________.

The umbilical vein contains blood that has a high level of: