Rocky Mountain Juniper (Juniperus Scopulorum) and One-Seeded Juniper (J

question 48

Multiple Choice

Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by ________.

• A) habitat isolation
• B) temporal isolation
• C) gametic isolation
• D) behavioral isolation

---

Definitions:

Thyroid Gland

A butterfly-shaped gland located in the neck that produces hormones regulating metabolism, energy, and growth.

Parathyroid

Small glands located on the thyroid gland in the neck that produce parathyroid hormone, which regulates calcium levels in the blood.

Follicle-Stimulating Hormone

A hormone released by the anterior pituitary gland that stimulates the growth of egg-containing follicles in females and sperm production in males.

FSH

Follicle-Stimulating Hormone, a hormone involved in the reproductive processes of both males and females, including the maturation of ovarian follicles and sperm production.