Using the chart, which of the following point mutations will cause the most harmful effect on an individual? (4 points) U C A G UUU Phenylalanine UCU Serine UAU Tyrosine UGU Cysteine U U UUC Phenylalanine UCC Serine UAC Tyrosine UGC Cysteine C UUA Leucine UCA Serine UAA Stop UGA Stop A UUG Leucine UCG Serine UAG Stop UGG Tryptophan G CUU Leucine CCU Proline CAU Hisitidine CGU Arginine U C CUC Leucine CCC Proline CAC Hisitidine CGC Arginine C CUA Leucine CCA Proline CAA Glutamine CGA Arginine A CUG Leucine CCG Proline CAG Glutamine CGG Arginine G AUU Isoleucine ACU Threonine AAU Asparagine AGU Serine U A AUC Isoleucine ACC Threonine AAC Asparagine AGC Serine C AUA Isoleucine ACA Threonine AAA Lysine AGA Arginine A AUG Methionine/Start ACG Threonine AAG Lysine AGG Arginine G GUU Valine GCU Alanine GAU Aspartate GGU Glycine U G GUC Valine GCC Alanine GAC Aspartate GGC Glycine C GUA Valine GCA Alanine GAA Glutamate GGA Glycine A GUG Valine GCG Alanine GAG Glutamate GGG Glycine G The sequence reads AUU; a change in the second base from U to C The sequence reads CGA; a change in the first base from C to A The sequence reads UGU; a change in the third base from U to A The sequence reads UUA; a change in the first base from U to C and a change in the third base from A to G

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:

it is a

explanation:

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs