The formation of the fertilization envelope in a sea urchin egg is most directly stimulated by an increase the cytosolic concentration of which a the following ions? O hydrogen ions O calcium ions O potassium ions Osodium ions
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
![O A hollow ball of cells
O A zygote
Question 17
The formation of the fertilization envelope in a sea urchin egg is most directly stimulated by an increase in the cytosolic concentration, of which of
the following ions?
O hydrogen ions
O calcium ions
O potassium ions
Osodium ions
Question 18
In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" to
polyspermy, respectively?
1 pt
O formation of the jelly coat and the vitellin membranes
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