Exam 27: Development and Inheritance

The various forms of any one gene are called

From which germ layers do the extra-embryonic membranes form,and what are each membrane's functions?

Figure 27-1 -Identify the stage labeled "8."

Molly is homozygous for the dominant black hair trait.Therefore,

A zygote whose genotype is XX will develop as a

A child born with one lone X chromosome will have

The embryonic heart starts beating as blood begins to flow through chorionic vessels at approximately ________ of development.

________ is the time spent in growing within the uterus.

Name the hormones synthesized by the syncytiotrophoblast.

The extra-embryonic membrane that forms blood cells is the

The developmental period heralded by the onset of puberty is known as

Outline the events that take place between exposure of the oocyte to spermatozoa and formation of the first blastomere pair.

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?

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

Name the four extra-embryonic membranes.

Figure 27-2 -Identify the structure labeled "4."

Endoderm + mesoderm = which extra-embryonic membrane(s)?

How do autosomes and sex chromosomes differ?

The mesoderm forms

Under the influence of the trophoblast,maternal blood vessels in the endometrium