Despite their seemingly simple anatomy and radial symmetry Sea urchins and sea star are a type of deuterostome, closely related to the chordates.
What are the characteristics of deuterostome?
Animals classified as deuterostomes share a common embryonic development.
The first opening during development known as the blastopore changes to the anus in deuterostomes while the mouth changes in protostomes.
They have a coelom, which forms as a result of enterocele (coelom from the digestive tract).
These creatures include the following,
- Chordata,
- Echinodermata,
- Hemichordata.
Hence the correct answer is Deuterostome.
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Answer:
S phase.
Explanation:
Meiotic interkinesis may be defined as the phase of cell resting and enters in the meiotic phase. The process of replication does not occur and this process is not a true interphase.
The cells that enter during the mitotic interphase does not undergo the synthesis or S phase. The chromosomes have two chromatids at this stage of interkinesis.
Thus, the correct answer is option (3).
Answer:
The sister chromatids were joined by fertilization, bringing together a maternal and paternal chromatid.
Explanation:
