In crosses involving complete dominance, the F2 genotypic ratio is 1:2:1 and is expressed as a phenotypic ____________________ ratio (express as x:x)
Fill in the blank(s) with correct word
3:1
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Chromosomal rearrangement can occur by ____
a. translocation only b. inversion only c. translocation and inversion d. point mutations e. alternative splicing
Recent research has indicated that for human ______ vocal pitch changes may be associated with a
state of fertility.
a. males b. females c. males and females d. females during menstrual cycle e. males during puberty
Crows feeding on whelks drop the whelks from the air until their shell breaks, allowing the crows to eat the mussel inside. What factor(s) is/are important for crows optimizing this foraging strategy?
A. the force of gravity in each drop and the height per drop B. the force of gravity in each drop C. the number of drops needed to break the shell D. the height per drop E. the number of drops needed to break the shell and the height per drop
In active transport, what provides the energy needed to move ins or molecules across the membrane?
a. sodium & potassium ions b. calcium ions c. sodium ions alone d. ATP molecules