Elongated structures of cells used for propelling the cell or for moving material over the cell surface are known as a. cilia and flagella. Genes have a specific DNA sequence of about 220 nucleotides that have a specific location on each. In prophase of mitosis a. In prophase of meiosis, homologous chromosomes come together and lie side by side. The non-specialized cells that begin spermatogenesis are a. spermatozoa.
Alleles are a. always dominant.
A tool used by geneticists to help predict the results of crosses is the a. genetic square. According to the Principle of Independent Assortment, a. both members of a pair of alleles go into the same gamete. For fertilization to occur, a sperm must penetrate an egg. Cleavages that occur around or on top of the yolk, instead of dividing the whole egg, are said to be a. diploblastic. The primary germ layer that gives rise to nervous tissue and sensory organs is a. gastroderm.