Embryology and Prenatal Development

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

Mesoderm

Trophoblast

Ectoderm (correct)

Endoderm

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

Inner cell mass (correct)

Endoderm

Mesoderm

Trophoblast

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

Mesoderm

Trophoblast

Endoderm (correct)

Ectoderm

What structures does the trophoblast and maternally derived tissue form?

Placenta and structures to support and nourish the embryo Signup and view all the answers

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

Alleles Signup and view all the answers

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

Loci Signup and view all the answers

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

Polymorphisms Signup and view all the answers

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

Races Signup and view all the answers

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

Dominant inheritance Signup and view all the answers

What type of genes are most X-linked traits?

Recessive Signup and view all the answers

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?

Dominant gene Signup and view all the answers

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

Codominant expression Signup and view all the answers

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

Homozygous state Signup and view all the answers

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

Hemizygous individual Signup and view all the answers

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

Codominant alleles Signup and view all the answers

What kind of genes are carried on sex chromosomes?

Sex-linked genes Signup and view all the answers

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

Codominant condition Signup and view all the answers

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

Heterozygous Signup and view all the answers

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

In either the heterozygous or the homozygous state. Signup and view all the answers

How are alleles of different genes expressed?

They differ in how they are expressed. Signup and view all the answers

Embryology and Prenatal Development

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Questions and Answers

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?

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