Magnification. At a cap of roughly 2,000 times, light microscopes can't magnify as closely as electron microscopes can. Light's relatively long wavelength decreases the light microscope's ability to magnify by requiring small spherical lenses to focus and spread out the light.

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3 years ago

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Blue-eyed mice interbreed and produce progeny with a 2:1 ratio of blue to non-blue. When blue is crossed with nonblue, a 1:1 rat

loris [4]

Explanation:

The results are explained if the trait blue eyes is dominant (B) over non-blue (b) and the dominant allele B is lethal in homozygous individuals.

<u>The possible genotypes and phenotypes are:</u>

Homozygous dominant (BB): lethal
Heterozygous (Bb): blue eyes
Homozygous recessive (bb): non-blue eyes

When blue (Bb) is crossed with non-blue (bb) the resulting offspring is 1/2 blue (Bb) and 1/2 non-blue (bb).

When non-blues interbreed (bb X bb) all progeny is non-blue (bb).

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3 years ago