Answer:
There will be 12 chromosomes
Explanation:
We have given that The epithelial cells in the skin of an animal have 24 chromosomes
We have to find the number of chromosomes present in the gametes of this animal
We know that number of chromosomes present in the gametes is given by

So number of chromosomes in gametes 
Divide the number of homozygous dominant individuals by the total population:
Answer:
A. Rheumatoid arthritis is characterized by periods of remission and exacerbation
C. Rheumatoid arthritis can cause fatigue and weight loss
Explanation:
C. Individuals moving into a population, gene flow can also be referred to as gene migration due to this