Explain why infertility in women increases with advancing age, and how ART methods can overcome this problem in older women
What will be an ideal response?
Infertility in women becomes more common with increasing age; up to one-third of couples in their late 30s are infertile.
The discovery that the age of the egg, not the age of the reproductive system, is a leading factor responsible for age-related infertility makes it possible for women in their late 50s or even into their 60s to become pregnant using IVF and eggs donated by younger women. This discovery also means that younger women can safely postpone childbearing until they are older without having to rely on donated eggs. Women can have their eggs collected and fertilized while they are young and frozen for later use. This form of ART allows younger women to produce embryos at a time when their risks for chromosome abnormalities in the offspring are low. The embryos can be thawed and implanted over a period of years—including after menopause—allowing women to extend their childbearing years.
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The method of nucleotide sequence determination that utilizes dideoxynucleotides was developed by ________.
Fill in the blank(s) with the appropriate word(s).
The difference between a population and a community in the same location is that
A. a community is an isolated subpopulation of a larger population of a species. B. a population includes members of one species, while a community includes its nonliving environmental resources. C. a population includes all the living organisms, while a community is the physical location in which they live. D. a community includes members of one species, while a population includes multiple species. E. a population includes members of one species, while a community includes populations of multiple species.
The random discrepancy between theoretical predictions and actual outcomes is called ________. [two words]
Fill in the blank(s) with correct word
Which of the following processes do not take place in the mitochondria?
(a) citric acid cycle (b) conversion of pyruvate to activated acetyl groups (c) oxidation of fatty acids to acetyl CoA (d) glycogen breakdown