Consider a hypothetical allele that is lethal, like the Tay–Sachs allele, but is dominant rather than recessive. Assume that this allele has a frequency of 0.02, like the Tay–Sachs allele. Recalculate the answers to 3a, 3b, and 3c. Is selection stronger against the recessive allele or the dominant one? Why? Assuming that mutation to the deleterious allele occurs at the same rate at both loci, which allele will occur at a higher frequency? Why?

Why is a dominant allele called dominant

With the description of the different cell walls, membranes, and associated proteins set in the students' minds, you now need to introduce them to the idea that the cell wall can also act as a foundation to build things upon. bacterial appendages require a strong foundation that will offer the support needed to move and function in a dynamic world. for example, flagella are long, whiplike protein structures that are used by many gram-positive and gram-negative bacteria for locomotion. in order to function effectively, a flagellum must be firmly anchored to the cell wall. how will you be able to get across the idea that the peptidoglycan cell wall is strong enough to support such a mechanism? with a protein rod that passes through the cell wall and protein rings used to anchor it in the membranes, these basal bodies are the rudimentary biological motors that use atp power to spin the hook and the flagella attached to it. bacterial flagella have a biological motor that spins within the cell wall and is powered by atp. this allows the flagella to spin in a whiplike motion to propel the bacterium.

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime