Developmental Biology exam with questions and answers
What is developmental biology? - ANSWER The merging of embryology and genetics that studies the
development of organisms from a fertilized egg to an adult form.
What is the central paradox of life in developmental biology? - ANSWER How a single fertilized egg can
give rise to a multicellular complex organism.
What does embryology study? - ANSWER The origin and development of an organism from a fertilized
egg to a form resembling an adult.
Name one importance of embryology. - ANSWER It serves as the foundation for modern sciences like
anatomy, genetics, and evolution.
What is organogenesis? - ANSWER The process of organ formation during development.
What is neoplastic growth? - ANSWER Abnormal proliferation of cells, often leading to tumors.
Define regeneration in developmental biology. - ANSWER The regrowth of body parts from pieces of an
organism.
What does tissue repair involve? - ANSWER Repair of tissue at levels ranging from molecular to
organismal.
What is developmental genetics? - ANSWER The study of genetic mechanisms involved in the
development of an organism.
What is the significance of genotype in developmental biology? - ANSWER It is translated into
phenotype, manifesting traits coded in the genes.
,What does descriptive embryology focus on? - ANSWER The processes that transform a single cell zygote
into a multicellular organism.
What is comparative embryology? - ANSWER The analysis of similarities and differences in the
development of different vertebrate groups.
What does experimental embryology involve? - ANSWER Testing hypotheses and manipulating embryos
through experiments.
Who is Wilhelm Roux? - ANSWER A pioneer in experimental embryology known for his work on
preformation and epigenesis.
What is teratology? - ANSWER The study of birth defects and abnormalities in development due to
genetic and exogenous factors.
What is phocomelia? - ANSWER A condition where long bones of the limbs are absent or severely
deficient, often caused by genetic factors or drugs like Thalidomide.
What is in-vitro fertilization (IVF)? - ANSWER A process that allows childless couples to have children
from their own genetic heritage.
What are some problems associated with IVF? - ANSWER Obtaining fertile eggs, surrogate mothers,
frozen embryos, and embryo manipulation.
What is cloning? - ANSWER The process of creating a genetically identical living being.
Who was Aristotle in the context of developmental biology? - ANSWER A philosopher who posed
questions about embryo formation and defined preformation and epigenesis.
,What are the two schools of thought regarding embryo formation? - ANSWER Spermists, who believe
the sperm contains a miniature individual, and Ovists, who argue the ovum contains a minute body
stimulated by seminal fluid.
What did Galen contribute to embryology? - ANSWER He learned about the structure of advanced
fetuses but faced limitations due to the size of early embryos.
What technological advancement aided embryology in the 17th century? - ANSWER The development of
the microscope.
What is the role of chemical embryology? - ANSWER To study the chemical and physical events in
development and their interactions.
What is the focus of reproductive biology? - ANSWER Research related to conception, contraception, and
early embryonic development.
What is the significance of the term 'ontogeny recapitulates phylogeny'? - ANSWER It suggests that the
development of an individual organism reflects the evolutionary history of its species.
What is the main focus of teratology? - ANSWER To understand abnormalities and malformations in
development due to genetic and environmental factors.
Who first observed human sperm using a microscope? - ANSWER Anton Van Leeuwenhoek in 1677
What did Anton Van Leeuwenhoek discover from a drop of pond water? - ANSWER Bacteria, protozoans,
and sperm cells
, What did Lazzaro Spallanzani demonstrate about sex products? - ANSWER Both female and male sex
products are necessary for the initiation of development.
What significant contribution did Marcello Malpighi make in embryology? - ANSWER He accurately
described the development of the chick in its egg and published the first microscopic account of chick
development in 1672.
What is Von Baer's Law? - ANSWER The general features of a large group of animals appear earlier in
development than the specialized features of a smaller group.
What theory did Karl Ernst Von Baer propose? - ANSWER The Germ Layer Theory, which describes the
development of ectoderm, mesoderm, and endoderm.
What did August Weissman distinguish between in his studies? - ANSWER Somatic cells and germ cells.
What is the significance of somatic cells according to Weissman? - ANSWER Somatic cells are vehicles for
protecting and perpetuating germ plasm.
What is the difference between totipotent and pluripotent cells? - ANSWER Totipotent cells can generate
all cells in an organism, while pluripotent cells can generate certain cells.
What does the term 'regulative development' refer to? - ANSWER The ability of an embryo to develop
normally even if some cells are removed or rearranged.
What was the main finding of Hans Spemann and Hilde Mangold's transplantation experiment? -
ANSWER A partial second embryo can be induced by grafting a small region of a new embryo onto
another embryo.
What did Wilhelm Johannsen distinguish between? - ANSWER Genotype (genetic information) and
phenotype (visible appearance).
What is developmental biology? - ANSWER The merging of embryology and genetics that studies the
development of organisms from a fertilized egg to an adult form.
What is the central paradox of life in developmental biology? - ANSWER How a single fertilized egg can
give rise to a multicellular complex organism.
What does embryology study? - ANSWER The origin and development of an organism from a fertilized
egg to a form resembling an adult.
Name one importance of embryology. - ANSWER It serves as the foundation for modern sciences like
anatomy, genetics, and evolution.
What is organogenesis? - ANSWER The process of organ formation during development.
What is neoplastic growth? - ANSWER Abnormal proliferation of cells, often leading to tumors.
Define regeneration in developmental biology. - ANSWER The regrowth of body parts from pieces of an
organism.
What does tissue repair involve? - ANSWER Repair of tissue at levels ranging from molecular to
organismal.
What is developmental genetics? - ANSWER The study of genetic mechanisms involved in the
development of an organism.
What is the significance of genotype in developmental biology? - ANSWER It is translated into
phenotype, manifesting traits coded in the genes.
,What does descriptive embryology focus on? - ANSWER The processes that transform a single cell zygote
into a multicellular organism.
What is comparative embryology? - ANSWER The analysis of similarities and differences in the
development of different vertebrate groups.
What does experimental embryology involve? - ANSWER Testing hypotheses and manipulating embryos
through experiments.
Who is Wilhelm Roux? - ANSWER A pioneer in experimental embryology known for his work on
preformation and epigenesis.
What is teratology? - ANSWER The study of birth defects and abnormalities in development due to
genetic and exogenous factors.
What is phocomelia? - ANSWER A condition where long bones of the limbs are absent or severely
deficient, often caused by genetic factors or drugs like Thalidomide.
What is in-vitro fertilization (IVF)? - ANSWER A process that allows childless couples to have children
from their own genetic heritage.
What are some problems associated with IVF? - ANSWER Obtaining fertile eggs, surrogate mothers,
frozen embryos, and embryo manipulation.
What is cloning? - ANSWER The process of creating a genetically identical living being.
Who was Aristotle in the context of developmental biology? - ANSWER A philosopher who posed
questions about embryo formation and defined preformation and epigenesis.
,What are the two schools of thought regarding embryo formation? - ANSWER Spermists, who believe
the sperm contains a miniature individual, and Ovists, who argue the ovum contains a minute body
stimulated by seminal fluid.
What did Galen contribute to embryology? - ANSWER He learned about the structure of advanced
fetuses but faced limitations due to the size of early embryos.
What technological advancement aided embryology in the 17th century? - ANSWER The development of
the microscope.
What is the role of chemical embryology? - ANSWER To study the chemical and physical events in
development and their interactions.
What is the focus of reproductive biology? - ANSWER Research related to conception, contraception, and
early embryonic development.
What is the significance of the term 'ontogeny recapitulates phylogeny'? - ANSWER It suggests that the
development of an individual organism reflects the evolutionary history of its species.
What is the main focus of teratology? - ANSWER To understand abnormalities and malformations in
development due to genetic and environmental factors.
Who first observed human sperm using a microscope? - ANSWER Anton Van Leeuwenhoek in 1677
What did Anton Van Leeuwenhoek discover from a drop of pond water? - ANSWER Bacteria, protozoans,
and sperm cells
, What did Lazzaro Spallanzani demonstrate about sex products? - ANSWER Both female and male sex
products are necessary for the initiation of development.
What significant contribution did Marcello Malpighi make in embryology? - ANSWER He accurately
described the development of the chick in its egg and published the first microscopic account of chick
development in 1672.
What is Von Baer's Law? - ANSWER The general features of a large group of animals appear earlier in
development than the specialized features of a smaller group.
What theory did Karl Ernst Von Baer propose? - ANSWER The Germ Layer Theory, which describes the
development of ectoderm, mesoderm, and endoderm.
What did August Weissman distinguish between in his studies? - ANSWER Somatic cells and germ cells.
What is the significance of somatic cells according to Weissman? - ANSWER Somatic cells are vehicles for
protecting and perpetuating germ plasm.
What is the difference between totipotent and pluripotent cells? - ANSWER Totipotent cells can generate
all cells in an organism, while pluripotent cells can generate certain cells.
What does the term 'regulative development' refer to? - ANSWER The ability of an embryo to develop
normally even if some cells are removed or rearranged.
What was the main finding of Hans Spemann and Hilde Mangold's transplantation experiment? -
ANSWER A partial second embryo can be induced by grafting a small region of a new embryo onto
another embryo.
What did Wilhelm Johannsen distinguish between? - ANSWER Genotype (genetic information) and
phenotype (visible appearance).
