What are alleles? Each cell actually contains two copies of each gene. The copies could be identical or they could be different versions of the same gene, called alleles. For example, everyone has a pair of genes that code for blood type. A person with Type AB blood has one allele that codes for A-type blood cell proteins and another allele that codes for B-type blood cell proteins, while a person with Type O blood has two alleles that don’t code for proteins at all, so the proteins are missing.

Alleles are

Which plant has a visible leaf modification that will it conserve water in extremely dry environments?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d