An individual has three number 21 chromosomes. Which is most likely the cause?

Anormal appearing couple is found to be heterozygous recessive for albinism both have the genotype aa the gene responsible for albinism is recessive to the normal pigment-producing gene what are the changes of their children being albino

A(n) is a molecule influences the way that a molecule reacts.

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what