Answer:
four phenotypes appear in the ratio 9:3:3:1
Explanation:
<em>For a dihybrid cross in which the two genes concerned obey simple dominant/recessive law and are independently assorting, </em><em>four phenotypes are produced in the ratio 9:3:3:1. </em>
The dominant gene takes up the largest ratio (9/16) while the recessive gene takes up the smallest (1/16). Any deviation from 9:3:3:1 and the number of phenotypes produced from a dihybrid cross is an indication that the genes involved do not obey Mendelian laws.
The cell has to go through the interphase
Interphase is split into g1, synthesis, and g2
G1 is most of the cells life, where it replicates organelles
Synthesis is where the DNA replicates, 23 chromosomes become 46
G2 is where the cell gets ready for mitosis (active cell division) here the microtubles are produced
Mitosis is split into prophase, metaphase, anaphase, telophase, and cytokinesis
It is believed that this happens because some signals that regulate development are the same between different species and because <span>they share ancient genes. </span>These ancient genes are expressed during a middle "phylotypic stage" of embryonic development for all species.
For example, human and animal embryos go through very similar stages of early development and share similar features such as tails and gill-like structures. The major difference appears to be how long it takes to reach each of these same stages.
Answer: Option D
Explanation:
Once the pathogen enters the body, it starts dividing and after a certain period of time the patients experience some sign and symptoms of illness.
The prodromal period occurs just after the incubation period. In this phase the pathogen keeps on dividing and the host begins to experience general symptoms and signs of illness.
This is a result of the activation of immune system of the body which results in the swelling, pain, soreness.
Answer:
Adapted to conserve water.
Explanation:
Living on land means limited access to drinking water, so reptiles' kidneys have adapted. They conserve water by producing less urine in more concentrated forms.
Hope this helps!
