Agardener purchased 20 full-grown pea plants. all 20 were the same genotype and had purple flowers. the gardener crossed two of these plants to get seeds for the next season. the seeds from the cross produced some plants with purple flowers and some with white flowers. the gardener learned that in pea plants the allele for purple flowers (p) is dominant of the allele for white flowers (p). what was the most likely genotype of the original 20 full-grown plants?

The original 20 full-grown plants’ genotype would have to be (1,2). When you make a Punnett square crossing two heterozygous, you see that you get these as a result: (1,1) (1,2) (1,2) and (2,2). Only the (2,2) can be white therefore it’s a 1/4 possibility of getting white flowers by crossing two full-grown purple pea plants.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.