Fruit flies have hair-like bristles on the back of their bodies. The bristles can be long or short. Flies with short bristles have two recessive alleles (ss) for the trait.
A fruit fly that is heterozygous for the bristle trait is crossed with a fruit fly that has
short bristles. The cross produces 220 offspring.
Use a Punnett square to help calculate how many of the 220 offspring are expected
to have short bristles.

the dark variety, as they are not visible on the dark tree barks

explanation:

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."