Hox genes, which are members of the homeotic transcription factor family, establish the segment identity of tissues within the embryo and are essential regulators of the body plan along the cranio-caudal axis (also known as the anterior-posterior axis). This means during embryogenesis, these genes expression follows a precise spatial and temporal colinearity pattern from the 3' to the 5' end of each cluster.
This indicates that Hox genes expressed anteriorly in the developing embryo are typically found at the 5′ end of the same genomic area, a phenomenon known as spatial colinearity. In comparison, those expressed posteriorly are typically found at the 3′ end of the Hox cluster.
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Tortoise shell cats can be explained as the offspring from a incomplete dominance cross. Incomplete dominance gives rise to an intermediate phenotype.
The scientific phenomenon that explains the color pattern is X-linked incomplete dominance.
- As stated earlier, the tortoise shell colour is as a result of incomplete dominance but as it exists only in females, the inheritance is X linked.
- This means the tortoise shell colour is inherited in the heterozygous condition as females have two X (XX) and males (XY) can only be either of the parent's true breeding genotype.
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<em>C. Both.</em>
Explanation:
Changes that occur in different groups of organisms overtime that produce variations in a population relate to both macroevolution and microevolution. Although they are different, they both relate to this subject.
Macroevolution is on a big scale. This goes over organisms <u>ancestors, large trends, and other groups of species</u> that may be involved. This goes over a longer bit of time and is not as in depth.
Microevolution is on small scale. This goes over the different changes that may have occurred in allele frequencies from things like <u>genetic drift, natural selection, or mutation</u>. This goes in much more depth and looks deeper into what type of evolution may have happened.
The following that is arranged from smallest to largest of organization is B. Compound, cells, tissues and organs.
