Free earlobes hang below the point where the ear lobe attaches to the head. attached earlobes do not hang, but are attached to the head. the gene for free earlobes is dominant (f), while the gene for attached earlobes is recessive (f). both of ashley’s parents have free earlobes but also carry a recessive gene for attached earlobes. ashley has attached earlobes, so she must have a) one dominant gene for free earlobes. b) two dominant genes for free earlobes. c) one recessive gene for attached earlobes. d) two recessive genes for attached earlobes.

answer:

i think "a" is right! wanna know how? ?

a, i am pretty sure.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: