During in vitro fertilization, the fertilized egg ____
a. is enucleated and fused with a donor egg
b. develops in a Petri dish to form an embryo containing 64 to 128 cells
c. develops in a Petri dish to form an embryo containing four to eight cells
d. develops in the host animal and eventually results in a clone born to the host
e. undergoes a second fertilization with a donor animal's sperm
c
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Silicoflagellates use silicon compounds in substrate-level phosphorylation
Indicate whether the statement is true or false.
Overexpression of ________ lead to the development of cancer in mice, and variations in their structure or amounts have been documented in various types of cancer cells.
Fill in the blank(s) with the appropriate word(s).
Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?
A) red-eyed females and white-eyed males B) white-eyed females and red-eyed males C) all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males D) all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females E) The result cannot be predicted because it depends on whether the female is homozygous or heterozygous.
If we continued to follow the cell lineage from question 4, then the DNA content at metaphase of meiosis II would be
A) 0.25x. B) 0.5x. C) x. D) 2x. E) 4x.