In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. allele b determines nonbaldness, and allele b determines pattern baldness. in males, because of the presence of testosterone, allele b is dominant over b. if a man and woman both with genotype bb have a son, what is the chance that he will eventually be bald?

75% of chance that their son would be bold

Explanation:

Doing a Punnet square, you can determine the chances that have the F1 whit certain characteristics.  

In a Punnet square, the capital letter represents a dominant characteristic, and the lower case letter represents a recessive characteristic. But in this case, because of the presence of testosterone, allele b is dominant over B.  Dominant mens that if is a pair of heterozygous chromosom, the dominant will appear in the phenotype, means physically. The recessive characteristic will prevail but only in the genotype

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.