Ahomozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). what are the genotypic and phenotypic ratios of the probable offspring?

Genotype- B= Brown and T= Tan
Genotype- BB because if the mouses mate they will give their dominant gene and they both share the same gene so their baby will have to have the same gene.
Phenotype- Brown Mouse
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~"AB84"~

Option). Mutations rarely occur.

Explanation:

Mutations can be defined as permanent, heritable changes in the sequence of DNA that transfer from one generation to next generation. Mutations are caused by errors during replication due to exposure of mutagens (mutation causing agents).

Mutations occur rarely as there are several repair mechanisms that repair the errors occur during replication or due to mutagens that can lead to development of mutations.

Although mutations lead to various disorders, not all mutations are harmful as some mutations are neutral and some mutations also show beneficial traits.

Mutations are not contagious as it is a genetic change, means they cannot spread from person to person.

Thus, the correct answer is first option.