Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. In fact, each species of plants and animals has a set number of chromosomes. A fruit fly, for example, has four pairs of chromosomes, while a rice plant has 12 and a dog, 39. Top of page.
The germination time for grass seed ranges from 5 to 30 days depending on the variety. It can be even longer than this in cooler temperatures. This is how long it will take to actually see the grass growing. Until this point, the seed, or the soil and mulch in contact with the seed, must stay moist.
Fastest Cool-Season Grass. Perennial ryegrass seed germinates in seven to 10 days, compared to 10 to 14 days for tall fescue seed and 14 to 21 days for Kentucky bluegrass seed. Perennial ryegrass is one of the cool-season grasses to grow to **obtain a thick lawn turf** **quickly**.*Select a grass seed suitable for your [grass climate zone](http://www.greatdayimprovements.com/when-to-plant-grass-seed-in-your-state.aspx)**, or else your new grass may be fast-growing but fleeting. In the United States, grasses are assigned [U.S.