True or False: Veins are muscular-walled vessels that carry blood away from the heart.

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?