When traits inherited from both parents are expressed, the alleles are said to have a. polygenic inheritance. b. mutations. c. incomplete dominance. d. codominance.

The correct answer is D) Codominance.

Codominance is a pattern of inheritance in which both the alleles for a trait are equally expressed.

In other words, both alleles are expressed equally instead of one being dominant over the other.  

For example- In ABO blood group system, A and B are codominant alleles. This means that A and B alleles when inherited by an individual, will express blood group AB.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.