Question

sister chromatids...... 19 0 answers is called a dihybrid is called a tetrad is called a bivalent are joined at the centromere

Explanation:

Sister chromatids are identical copies formed during DNA replication and are joined at the centromere. A dihybrid refers to a cross - breeding experiment involving two traits. A tetrad is formed during meiosis when homologous chromosomes pair up, and a bivalent is another term for a pair of homologous chromosomes. The key characteristic of sister chromatids is that they are joined at the centromere.

Answer:

Are joined at the centromere