You perform a backcrossing experiment to map regions of the corn genome that responsible for kernel size. first, you cross true breeding plants with large kernels to true breeding plants with small kernels. the f1 hybrids have medium size kernels. you then backcross the f1 to the parents with small kernels, and you genotype the backcross progeny at 100 marker loci. you observe that progeny that are heterozygous at locus 1 have larger kernels than individuals that are homozygous at locus 1. in contrast, individuals that are heterozygous at locus 2 have the same size kernels as individuals that are homozygous at locus 2. which of the following statements is most consistent with your results? a) both loci 1 and 2 are in linkage disequilibrium with genes that affects kernel size. b) neither locus 1 or 2 is in linkage disequilibrium with a gene that affects kernel size. c) locus 2 is in linkage disequilibrium with a gene that affects kernel size. d) locus 1 is in linkage disequilibrium with a gene that affects kernel size.

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:

i think the answer would d