In cocker spaniels, black coat color (B) is dominant
over red (b), and solid color (S) is dominant over
spotted (s). If two dihybrids (Bb Ss) are crossed,
what fraction of the black, solid offspring will be
homozygous?
a. 4/16
b. 9/16
c. 1/9
d. 3/16
e. 3/4
Answer: c
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If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is
a. diploid. b. unable to undergo meiosis. c. haploid. d. none of the above.
Crossing over ____
a. generally results in binary fission b. involves nucleoli c. involves breakages and exchanges being made between sister chromatids d. results in new combinations of alleles being channeled into the daughter cells e. is the same as disjunction
In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?
A) two rRNAs (15S each) B) three rRNAs (5S, 16S, and 23S) C) two tRNA transcripts D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts
The tissue lining the mouth, organs of the digestive system, and inner surfaces of the lungs is classified as
A) connective. B) epithelial. C) nervous. D) muscle. E) connective and nervous.