Question

One week old embryo can be preserved at

• A. $-{196}^{\circ }$
  
• B. $-{200}^{\circ }$
  
• C. $-{270}^{\circ }$
• D. None of these

Answer 1

The correct option is A $-{196}^{\circ }$


Liquid nitrogen can be used to preserve one-week old embryos. The temperature of liquid nitrogen is $-{196}^{\circ }$. These are the embryos obtained through techniques like IVF. Such sophisticated techniques are used to create new varieties of cattle through cross-breeding. Following are few advantages of embryo preservation:

• Donor genotype is preserved;
• A homozygous embryo can be frozen;
• Recovery of a line is inexpensive and simple.
• The transport of frozen embryos over long distances is an inexpensive way to export farm animals.