A team of scientists is studying the inheritance of eyelash length in humans. Eyelash length is either long or short, and is controlled by a single autosomal gene. The eyelash lengths of the members of one family are shown in the pedigree below. The pedigree labels the generations I, II, and III. The male and female in Generation I are the parents of the three males shown in Generation II, and the grandparents of the three females shown in Generation III. Which of the family members MUST be heterozygous for the trait of eyelash length, meaning their genotypes include one allele for long eyelashes and one allele for short eyelashes?

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).

"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."