Exam 21: Human Development and Genetics

A few moments after birth,the baby's ____________________ system begins functioning because the ____________________ have inflated.

Homologous chromosomes are a pair of chromosomes that may also be called ____________________ and ____________________.

For the embryo,the amnion:

The two members of a homologous pair of chromosomes have genes for the ____________________.

The embryonic membrane that forms the fetal portion of the placenta is the:

The embryonic membrane that contains fluid to cushion the embryo is the:

The sex chromosomes in men are called ____________________.

The stem cells of a blastocyst are found in:

An ectopic pregnancy is one in which:

The placental hormone that inhibits contractions of the myometrium during pregnancy is:

Blood is carried from the placenta to the fetus by the:

In later pregnancy,the placenta secretes the hormones ____________________ and ____________________.

When a zygote undergoes cleavage,the process involved is:

The portion of the blastocyst that contains the potential embryo is the:

A gene is the genetic code for one:

For people,having dimples is dominant and having no dimples is recessive. Genetics problem: Mom has no dimples and Dad is homozygous for dimples.The percent chance that a child of theirs will have dimples is ____________________.

The blastocyst is an early embryonic stage,and the cells of the inner cell mass are ____________________,because they are not yet specialized.

During pregnancy,the hormones that prepare the mammary glands for lactation are ____________________ and ____________________.

For people,a widow's peak is dominant and a straight hairline is recessive. Genetics problem: Both Mom and Dad are heterozygous for a widow's peak.The percent chance that a child of theirs will have a straight hairline is ____________________.

Genetics problem: Mom is heterozygous for type A blood and Dad is homozygous for type B blood.The chance that their child will have type B blood is: