It's body cells would have 40 chromosomes and its gametes would contain half of the total genetic information, 20 chromosomes.
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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In both you are unable to breathe.
Answer: Incomplete dominance
Explanation: In incomplete dominance, there will be a mixture of the two alleles. In codominance, both alleles are expressed in the phenotype. In this case, an example of codominance would be the flower being half white and half red.