Which developmental sequence is correct?
A) cleavage, blastula, gastrula, morula
B) cleavage, gastrula, morula, blastula
C) cleavage, morula, blastula, gastrula
D) gastrula, morula, blastula, cleavage
E) morula, cleavage, gastrula, blastula
Answer: C) cleavage, morula, blastula, gastrula
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Which of the following statistical tests is used to determine if two genes are linked or assorting independently?
A. Sum rule B. Binomial expansion C. Product rule D. Chi-square test
NEW: In cats, the gene for coat color is found on the X chromosome. Shown below is a mass of cells making up an early female cat embryo. The X chromosomes are shown in each cell; this embryo has one orange coat color allele (O) and one black coat color allele (B). Which of the following is ACCURATE about this embryo?
A. It will give rise to a calico cat.
B. It will give rise to a black cat, because black is dominant to orange.
C. It will give rise to an orange cat, as the paternal chromosomes carrying the black allele will be inactivated.
D. Since it is heterozygous, it will give rise to a cat with two Barr bodies in each cell.
E. Since it is heterozygous, it will give rise to a calico cat with two Barr bodies in each cell.
The most stable array of species in a given area is called a(n) ____________________ community. Fill in the blank(s) with the appropriate word(s)
Approximately how many doublings can normal human fibroblasts undergo in culture?
a. 50 to 100 b. They will go on proliferating indefinitely. c. They will not double at all but dispersing them in culture allows them to be studied in isolation from other cell types. d. five