Mating an individual expressing a dominant phenotype, but whose genotype is unknown, with an individual

expressing the corresponding recessive phenotype is an example of a(n):
a. heterozygous cross.
b. F1 cross.
c. F2 cross.
d. parental cross.
e. test cross.


e

Biology & Microbiology

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If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?  

A.  phosphate groups only B.  alternating phosphate groups and sugars C.  sugars only D.  purines and pyrimidines E.  phosphate groups and bases

Biology & Microbiology

Inverted repeats are common features of transcription termination sequences in all three domains of life

Indicate whether the statement is true or false.

Biology & Microbiology

Sperm are stored in the _____.

A. interstitial cells B. seminiferous tubules C. vasa deferentia D. perineum

Biology & Microbiology

In bacteria, transcription termination is partly controlled by?

a. the -10 and -35 sequences in the promoter b. hairpin loops in the RNA c. the polyA tail d. the translation start site

Biology & Microbiology