Answer:
Frequency of individuals with recessive trait(dd)
%
Explanation:
Please see the attached.
In the image it is clear that there are total
mouse out of which
are dark colored.
Since dark color allele is dominant, these
dark colored mouse will have genotype either DD or Dd
The individuals with genotype "dd" will be of light color.
Number of light colored mouse ![= 21 -6 = 15](https://tex.z-dn.net/?f=%3D%2021%20-6%20%3D%2015)
Frequency of individuals with recessive trait(dd)
![= \frac{15}{21} * 100\\](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B15%7D%7B21%7D%20%2A%20100%5C%5C)
%
Answer: Scientists think that early amphibians had lungs becuase they needed efficient oxygen uptake to support their metabolism. Higher rates of metabolism are needed on land, becuase of this scientist think that early amphibians breathed air with lungs.
Explanation:
The six types of synovial joints are the pivot, hinge, saddle<span>, plane, </span>condyloid<span>, and ball-and-socket joints</span>