During meiotic prophase in a eukaryotic cell, Spo11 initiates recombination by causing a double-strand break in DNA between Gene A and Gene B on one sister chromatid. Which of these events will occur prior to formation of a Holliday junction?
A) A heteroduplex forms due to pairing of Gene A and Gene B.
B) Resolvase cuts all four chromatids.
C) Spo11 causes a double-strand break in a nonsister chromatid.
D) Strand invasion causes one strand of the uncut chromatid to form a D loop.
E) Branch migration lengthens the heteroduplex region to include Gene A and Gene B.
D) Strand invasion causes one strand of the uncut chromatid to form a D loop.
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Surgical removal of the pancreas would
A. prevent the production of chyme in the stomach. B. block the secretion of bile. C. eliminate the ability to store bile in the gallbladder. D. increase the acidity of the small intestine. E. All of these changes would be a result of pancreas removal.
If a man expresses an X-linked recessive trait, his ____________________ was either homozygous or heterozygous
for the traitFill in the blank(s) with the appropriate word(s).
Golden rice contains a transgene that allows for increased production of vitamin A
a. True b. False
What is a fruit species that can be propagated by apomixis?
a. apple b. peach c. citrus d. pear e. peach