Which of the following is true about the alleles for hemoglobin in humans?

a)
differences in the dna sequences of alleles a and s account for the difference in the hemoglobin molecules produced.

b)
individuals with the genotype aa will have misshapen red blood cells.

c)
the difference between allele a and allele s is due to changes in the environment.

Need asap plz hurry im being timed when a body cell divides through the process of mitosis, the chromosomes in the daughter cells a. represent only the healthiest chromosomes from the parent cell. b. represent only half of the chromosomes in the parent cell. c. are identical to the chromosomes of the parent cell. d. are formed when chromosomes from the parent cell cross over.