Cystic fibrosis is caused by the allele f, which is completely recessive to the normal dominant allele F. Consider a couple who both have the genotype Ff. What is the chance that their second child will develop cystic fibrosis?
A) 25%
B) 50%
C) 75%
D) 100%
E) It depends on which alleles were inherited by their first child.
A
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The major reductive amination pathway for incorporation of nitrogen into amino acids initially involves the production of ________ from alpha-ketoglutarate.
A. tryptophan B. cysteine C. glutamate D. arginine
By the end of meiosis I of oogenesis, an oogonium becomes
A) an ovum and a tropical body. B) a secondary oocyte and a polar body. C) two polar bodies of equal size. D) two diploid cells.
The characteristic ____________________ of a radioisotope allows us to determine the age of rocks and fossils using
a technique called ____________________. Fill in the blank(s) with the appropriate word(s).
________ cells have axons that can transmit nerve impulses in addition to being able to secrete hormones like endocrine cells
Fill in the blank(s) with correct word