Development – Flashcards

Even in the absence of sperm, metabolic activity in an egg can be artificially activated by ________

The formation of the fertilization envelope requires an increase in the availability of ________

Contact of a sea urchin egg with signal molecules on a sperm causes the egg to undergo a brief ________

The plasma membrane of the sea urchin egg _______

Fertilization of an egg without activation is most like ___________

A reproductive difference between sea urchins and humans is _____________

During fertilization, the acrosomal contents ________

In a newly fertilized egg, the vitelline layer ___________

In sea urchins, the "fast block" and the long lasting "slow block" to polyspermy, respectively are ______

IN an egg cell treated with a chemical that binds calcium and magnesium ions, the _________

In mammalian eggs, the receptors for sperm are found in the ________

A human blastomere is _________

At the moment of sperm penetration, human eggs ___________

In a developing frog embryo, most of the yolk is _________

Among these choices, the largest cell involved in frog reproduction is _________

The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called _______

As cleavage continues during frog development, the size of the blastomeres __________

The vegetal pole of a frog zygote differs from the animal pole in that ________

Meroblastic cleavage occurs in ______

Which of the following correctly displays the sequence of developmental milestones?

The first cavity formed during frog development is the _________

In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. In this case, the sperm appear to be used only for ________

The cortical reaction of sea urchin eggs functions directly in ________

The structure of the Drosophila gene, called Tinman, is similar to a gene in humans that also _________

From the earliest to latest, the overall sequence of early development proceeds in which of the following sequences?

An embryo with meroblastic cleavage, extra embryonic membranes, and a primitive streak must be that of _________

Cells move to new positions as an embryo establishes its three germ tissue layers during _______

The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is ___________

If gastrulation was blocked by an environmental toxin, then _________

The archenteron of the developing sea urchin eventually develops into the _______

In a frog embryo, gastrulation _________

Which of the following is a correct description of the fate of the germ layers?

The primitive streak in a bird is the functional equivalent of ________

In all vertebrate animals, development requires ___________

The least amount of yolk would be found in the egg of a __________

At the time of implantation, the human embryo is called a ___________

Uterine implantation due to enzymatic digestion of the endometrium is initiated by the _____________

Thalidomide, now banned for use as a sedative in pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy. Some of these women gave birth to children with arm and leg deformities, suggesting that the drug most likely influenced _________

The migratory neural crest cells ________

From the earliest to latest, the overall sequence of early development proceeds in which of the following?

Changes in cell position occur extensively during ______________

Changes in the shape of a cell usually involve a reorganization of the _________

When we compare animal development to plant development, we find that ___________

Select the choice that correctly associates the organ with its embryonic sources

The embryonic precursor to the human spinal cord is the __________

During metamorphosis, a tadpole tail is reduced in size by the process of ____________

The term applied to a morphogenetic process whereby cells extend themselves, making the mass of cells narrower and wider, is ___________

Which of the following is common to the development of birds and mammals?

The archenteron of a frog develops into the __________

What structural adaptation in chickens allows them to lay their eggs in arid environments rather than in water?

If an amphibian zygote is manipulated so that the first cleavage plan fails to divide the gray crescent, then

Hans Spemann and colleagues developed the concept of the organizer in amphibian embryos while studying the _________

The arrangement of organs and tissues in their characteristic places in a 3D space defines

In humans, identical twins are possible because ______

Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues. This result indicates that the transplanted cells were _________