Eric is observing various types of eggs and trying to correlate them with the mode of fertilization. One of the eggs has a calca
reous shell with a large amount of yolk. Another is wet with a moderate amount of yolk and with many coatings of jelly above it. What could be the mode of fertilization of the animals to which they belong?Select one of the options below as your answer:A. External and internal, respectively B. Internal and external, respectively C. Both external
The first egg has a calcareous shell, so we can imagine it is a dry and hard shell, and the egg has a large amount of yolk. These are characteristic of an egg generated from the internal fertilization, where the union of gametes occurs within the animal's body. During copulation the male uses his genitals or copulators to release sperm into the female's body, which results in an egg similar to the one described in the above question. Birds have this type of fertilization.
The second egg has a wet appearance, with gelatinous substances on its surface. These are characteristic of eggs resulting from external fertilization, where gametes fuse outside the female's body in the environment. In external fertilization, there must be water for the male gametes to move to the female. In addition, males need to eliminate large numbers of gametes to ensure they reach the eggs. Fish have this kind of fertilization and this kind of egg.
In order to determine what number of offspring will have attached earlobes, we must make a Punnett table. We know that attached earlobes are the dominant gene, and we know unattached earlobes are recessive.
| P | p
——————-
P | PP | Pp |
——————-
p | Pp | pp |
As we can see, only one out of the four squares has two recessive genes. Therefore, our answer would be A - 3:1.
For you to understand the process we can say that the weak will die. If the animal or organism can't get food or find any it is naturally "selected" to die.So a Cuticle could have evolved like that. Hope tgis is useful
