Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 1
B) 2
C) 3
D) 4
C) 3
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In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
Understanding cell division requires knowledge about
a. information that guides inheritance. b. how information in a parent cell is copied. c. mechanisms that distribute information to daughter cells. d. mechanisms that ensure new individuals receive parental information. e. all of these.
Each carbon atom can share pairs of electrons with as many as ____ other atoms
a. 2 b. 3 c. 4 d. 5 e. 6
How do animals identify their territories?
What will be an ideal response?