One possible explanation for why ____________________ is a primary risk factor for autosomal trisomy is that

oocytes remain in meiosis I until ovulation, which could take place many years after birth, making them more susceptible
to damage.Fill in the blank(s) with the appropriate word(s).


maternal age

Biology & Microbiology

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Communication between cells of the immune system is accomplished in many cases through

A) allelic exclusion. B) clonal deletion. C) cytokines. D) allelic exclusion, clonal deletion, and cytokines.

Biology & Microbiology

Explain why a potentially rabid dog is held for up to two weeks to check for clinical signs of rabies. Are humans more similar or dissimilar in this regard?

What will be an ideal response?

Biology & Microbiology

________ prevent the backflow of blood in veins

Fill in the blank(s) with correct word

Biology & Microbiology

The ________ from Agrobacterium tumefaciens is used in genetic engineering involving crop plant genes.

A. Ti plasmid B. DNA C. Ti vector D. restriction endonucleases

Biology & Microbiology