You have one tree that produces big yellow apples and another tree that produces small red apples. when the two are crossed, you find that half the offspring trees produce big red apples and half produce big yellow apples. what are the genotypes of the parents? a = big apples; a = small apples; r = red apples; r = yellow apples. aarr and aarr aarr and aarr aarr and aarr aarr and aarr

The genotypes of the parents are AArr and aaRr

Since, half the offspring trees produce big red apples and half produce big yellow apples we can conclude:

That all of the offspring inherited dominant trait for the size of apple (all of them are big) so, AA from one parent and aa from another can combine and form all heterozygous genotypes Aa. On the other hand, trait for the apple color is expressed 50-50-% (rr and Rr form Rr Rr rr rr genotypes).

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.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.