A patient at a fertility clinic has been diagnosed with "luteal phase defect" (LPD). Her progesterone levels are low and her cycles are short. What step of reproduction are these symptoms disrupting?
A. Implantation
B. Follicle development
C. Fertilization of the egg
D. Ovulation
Answer: A
You might also like to view...
What are comb plates used for?
a. Disabling prey b. Bioluminescence c. Locomotion d. Digestion
Peahens prefer to mate with peacocks that have
the brightest and largest tail displays. The peacock’s tail is, in and of itself, a disadvantage to the males. It is large and cumbersome and the males are more easily caught by predators because of it. Given these facts, why isn’t the peacock’s tail selected against by natural selection?
a. peacocks lack the mutations to allow selection to work b. it is working- peacocks are slowly going extinct c. in spite of the disadvantage, peacocks with larger tails leave more offspring d. it is selected against but because a peahen gives birth to so many males, the population is not greatly affected e. this is one of those mysteries of biology
In the example above, what is the probability
that this couple will have a normal child?
a. 0 b. 1/4 c. 1/3 d. 2/3 e. 1/2
Gymnosperms are characterized by producing "naked seeds." Which of the following groups is NOT classified as a gymnosperm?
A. ginkgoes B. horsetails C. cycads D. conifers E. gnetophytes