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sveticcg [70]
3 years ago
11

In an eight-cell embryo of an organism, the cells of the upper tier are aligned over the cells of the lower tier at a slight ang

le. Which organism is it likely to be? The choices are the following: Earthworm. . . . Starfish. . . . Sea cucumber. . . . Sea urchin.
Biology
2 answers:
morpeh [17]3 years ago
8 0
<span>I think the correct answer among the choices listed above is option C. The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.</span>
DochEvi [55]3 years ago
4 0

Answer:

Earthworm

Explanation:

Star fish, sea urchin and sea cucumber are echinoderms and exhibit radial cleavage.  The two tiers of cells of their eight cell embryo are aligned directly over each other. Earthworms are annelids and exhibit spiral cleavage during embryonic development in which upper tier of cells made an angle with cells of lower tier in eight celled embryo.

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Gregor Mendel discovered the principles that governs heredity, in which one of them is that an allele called DOMINANT allele, is capable of masking the expression of its variant allele called RECESSIVE allele in a heterozygous state. However, there has been genetic scenarios contrary to this his LAW OF DOMINANCE.

One of those Non-mendelian pattern of inheritance is a phenomenon called INCOMPLETE DOMINANCE, where an allele does not mask the expression of another completely, instead their combined state produces a third intermediate phenotype that is different from both parents. This is the case of the homozygous black bull mated with a homozygous white cow to produce a grey calf. The grey phenotype is an intermediate phenotype of both the black and white colours that forms due to incomplete dominance.

Another genetic scenario is called CO-DOMINANCE, where one allele is neither dominant nor recessive to the other allele, but instead both phenotypes becomes simultaneously expressed in the heterozygous offspring. In this case, the black bull and white cow were mated to form a heterozygous calf with both black and white spots.

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