One way embryonic cells can learn their position in an embryo is by detecting the concentration of a
What will be an ideal response?
Answer: morphogen: this is the definition of a morphogen, a molecule that exists in a concentration gradient and provides spatial information to the embryonic cells based on the local concentration. some morphogens are hormones, such as auzin in plant development; some morphogens are mRNAs or proteins, such as biocoid in fruit fly development. transcription factors control what genes are activated or repressed in different cell types, and play a role in development. Genes are not present in concentration gradients.
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During weeks 5 - 6 which major structural feature is present on the developing embryo?
a. Stubby tail b. Pharyngeal arches c. Lower limb buds d. Umbilical cord e. Distinct fingers and toes
The competitive exclusion principle states that
A) one species will always win out. B) two species cannot coexist unless they cooperate. C) two close competitors cannot coexist. D) one species will feed on another until it is extinct.
The gross reproductive rate is
A) the total number of offspring born to a population. B) the total number of offspring born to a population each year. C) the average number of female offspring born in a year. D) the average number of female offspring born to her over her lifetime.
The repeating sequence of events in eukaryotes that involves cell growth and cell division is called the ___ ____
Fill in the blank(s) with the appropriate word(s).