D is the symbol for the dark-haired allele; d is the symbol for the blond-haired allele. Four children have the following allele pairs: Kevin has DD, Chris has Dd, Kelly has dD, and Vince has dd. Which child is considered recessive homozygous and has blond hair?

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

Describe characteristics of a good respitory surface

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.