Exam 26: Development and Inheritance

Identify what process is occurring at the structure labeled "13."

The gradual modification of anatomical structures during the period from conception to maturity is

If a color-blind (X-linked recessive trait) man marries a woman who is heterozygous for the trait, what proportion of their male offspring can be expected to be color blind?

During implantation, the

The ________ is formed by the allantois, blood vessels, and yolk sac.

In simple autosomal inheritance, phenotypic characters are determined, or controlled, by

Contact of a sperm with the oocyte membrane causes

Which of the following is one of the critical events of the first trimester?

Ectoderm is to ________ as mesoderm is to ________.

Figure 26-1 Early Human Development Use Figure 26-1 to answer the following questions: -Identify the stage labeled "12."

If fertilization occurs, the ________ is maintained because the embryo secretes ________.

The extraembryonic membrane that forms blood cells is the

A trimester is ________ months long.

Embryological and early fetal development occur in the ________ trimester.

All of the following are True of the allantois, except that

If an individual carries a pair of alleles that are the same, the individual is ________ for the trait.

The period of gestation that is characterized by the largest fetal weight gain and fat deposition is the ________ trimester.

A zygote whose genotype is XY will develop as a ________.

Which of these statements about the trophoblast is False ?

________ is the time spent in prenatal development.