Color blindness is an X-linked recessive condition. Which parental genotypes below would result in children who are all normal-vision daughters and all color-blind sons?
(B = allele for normal color vision; b = allele for color blindness.)

Bb or bb since the lowercase B is recessive males are only able to pick up the recessive gene where females cannot but, can be carriers of it.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.