Do not touch anything
tell the teacher asap
Answer:
The correct answer is option 3. "Ab and aB".
Explanation:
Crossing over of two chromosomes, or chromosomal crossover, is the exchange of genetic material between two homologous chromosomes. This genetic process is responsible for the genetic variations that occurs during sexual reproduction. Usually crossing over occurrs between matching genetic sequences, therefore a diploid invidual with an AB allele that crosses over with an invidual with ab allele will exchange each allele in equal parts. The resulting chromosomes will be Ab and aB, one part per allele.
An experiment or survey must be controlled in order to receive accurate results.
In an experimental group, the independent variable is changed. But in the control group, the independent variable stays the same.
The direct benefit of the herding behavior in the area marked "Z" is protection.
Typically animals that live in open spaces and are preyed upon often, such as zebras, will aggregate into very large groups. Thus, the chance of being singled out and killed decreases dramatically with increasing numbers of individuals.
Although they form a group, each individual animal will still act for its own benefit, instead of the benefit of the group. Because of this, during stampedes, some animals may be injured or even killed, not by predators, but by the other members of the herd.