Biology 11th Edition by Gerald Audesirk,Teresa Audesirk,Bruce Byers

تمرين 1

In the pedigree of part (a) of Figure, do you think that the individuals showing the trait are homozygous or heterozygous? How can you tell from the pedigree?
FIGURE Family pedigrees (a) A pedigree for a dominant trait. Note that any offspring showing a dominant trait must have at least one parent with the trait (see Figs. 10-8, 10-9, and 10-11). (b) A pedigree for a recessive trait. Any individual showing a recessive trait must be homozygous recessive. If that person's parents did not show the trait, then both parents must be heterozygotes (carriers). Note that the genotype cannot be determined for some offspring, who may be either carriers or homozygous dominants.