Embryology and Prenatal Development

Which layer of cells forms the external covering of the body and the nervous system?

What is the name of the group of cells that will give rise to the embryo?

Which layer forms the internal 'lining' of the pharynx, respiratory tract, and gastrointestinal tract?

What structures does the trophoblast and maternally derived tissue form?

What are the alternate forms of a gene found on the maternal and paternal chromosomes called?

What term is used to describe the chromosome site of a given gene?

Which term refers to the common variant forms of alleles found in populations?

What represents frequency differences in many polymorphic genes that define populations historically derived from different areas?

What type of inheritance pattern is expected if the trait (disease) appears in one of the parents of the affected child?

What type of genes are most X-linked traits?

If a male receives an X chromosome containing a defective gene, what does the defective X-linked gene function like when paired with the Y chromosome?

What is the term for individuals inheriting either one or two A or B alleles having blood types A or B, respectively?

In which state does a recessive gene produce a detectable phenotype?

What term is used to describe an individual who possesses only one X chromosome and cannot be heterozygous or homozygous for X-linked genes?

What type of alleles are expressed when both A and B alleles are present at the ABO gene locus, resulting in blood type AB?

What kind of genes are carried on sex chromosomes?

What is the term for the condition in which there are detectable differences between homozygous or heterozygous expression of a dominant allele?

What term describes individuals carrying two different alleles for a particular gene?

In what type of expression does a dominant gene express itself?

How are alleles of different genes expressed?