What does the blastopore develop into in lower classes of animals?
Another word for birth.
exchange of nutrients, gases and wastes with blood of the mother
Function of the placenta in the embryonic development in mammals
List the two main parts of human development
related animals share embryonic stages
Two supporting arguments for "Ontogeny recapitulates phylogeny": 1) _______, 2) higher animals evolved from lower animals
Name the process by which cells of the blastula fold inward to form the early gastrula.
From which embryonic germ layer does the reproductive system form?
The means by which development of the embryo is usually orderly.
8 to 10 weeks
How old is the embryo at the end of the embryonic period?
In which stage of embryonic development does the embryo begin to grow in size?
thoracic, abdominal, cranial
Give example of three body cavities that develop from the coelom formed in the gastrula
In which stage of embryonic development does the yolk plug become apparent?
What does the blastopore develop into in higher classes of animals?
In which stage of embryonic development do the three distinct germ layers appear?
What is the term used to describe the fact that gene regulating substances are not distributed equally throughout the cytoplasm of an oocyte, resulting in daughter cells receiving different gene regulating substances and being able to turn on/off different genes?
What structure in an embryo induces formation of the nervous system?
The neural plate forms on the dorsal or ventral side of the gastrula?
Which pole of the embryo in cleavage stage are faster to divide?
brain and spinal chord
Into what structures does the neural tube form?
In which developmental stage does the neural plate appear?
The reproductive system develops from which embryonic germ layer?
At which pole of the developing embryo does cleavage begin?
Part of the embryo that induces the formation of an adjacent organ - such as the notochord - by releasing one or more chemical substances.
refinement of organs and growth
what occurs in the fetal part of human development?
The outermost extra embryonic membrane that forms the fetal portion of the placenta in mammals?
Which phylum are humans classified into?
gene regulating substances
What is not distributed evenly throughout the cytoplasm that causes ooplasmic segregation?
The third cleavage of preembryonic development goes in which direction?
2 but may be fused
How many placentas are involved in a pregnancy with fraternal twins?
In which germ layer of a developing embryo do coelom form?
In which stage of embryonic development does the archenteron clearly appear?
Another name for fertilization
inner cell mass
Totipotent cells that are found at the animal pole of the blastocyst.
The respiratory system develops from which embryonic germ layer?
The extra embryonic membrane that contains fluid in which the embryo can be protected from drying out and protected from mechanical shocks.
Which level of taxonomic category is Chordata?
Which portion of the embryo in the cleavage stage is creamy white?
How many amnions are involved in a pregnancy with fraternal twins?
which genes are turned on or off
What do gene regulating substances determine?
Inner cell mass of the human blastula that have the potential to develop into a complete individual.
The development process through which we are able to distinguish between an arm a leg.
Which germ layer lines the outside of the embryo?
cleavage, blastula, gastrula, neurula
What are the four stages of embryonic development that are shared by 5 classes of higher animals.
In which hemisphere of a human blastocyst will you find the totipotent inner cell mass
If the cleavage furrow does not completely separate the two halves of totipotent cells in a zygote, what is the result?
ectoderm, neural groove, neural tube, brain and spinal chord
Put these structures into their order of development in the embryo: neural groove, neural tube, brain and spinal chord, ectoderm.