Organisms 1 Four of the classes of vertebrates and five possible
descriptions of these classes are shown below.
Draw a straight line to match each class of
vertebrate to its description.

class of vertebrate
/description
body with naked skin, two pairs of limbs
bird
fish
body with hair, two pairs of limbs
mammal
body with feathers, one pair of wings
reptile
body with scales, with fins
body with scaly skin, two pairs of limbs
or no limbs
​

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:

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