Under what condition might a human female have the XY sex chromosome complement?
What will be an ideal response?
This female would have one complete X chromosome and a Y chromosome that lacks SRY.
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Deoxygenated blood is initially collected by the:
a. dorsal aorta. b. sinus venosus. c. atrium. d. bulbus arteriosus. e. vena cava.
Animals living in the supralittoral fringe must be able to deal with the force of wave shock
Indicate whether the statement is true or false
UV rays from the sun cause a specific type of improper base pairing called a thymine dimer. If a cell cannot correct this problem, the section of DNA can be removed, causing a deletion of several nucleotides. What will this cause?
A) A point mutation forms that leads to a change in one amino acid. B) A point mutation forms that leads to changes in a handful of amino acids. C) The codons shift by one letter, and all the codons before the mutation are changed. D) The codons could shift by one letter, and all the codons after that point would be off.
You will not observe __________ in animal cells.
A) mitochondria B) a plasma membrane C) ribosomes D) a cell wall