Biology 1100 - Principles of Biology » Fall 2019 » Quiz

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Question #1
Let Y=yellow, y=green, R=round and r=wrinkled. You cross YYRR pease with yyrr peas. All of the F1 individuals are yellow and round with a genotype of YyRr. You then perform an F2 cross and get the expected 9:3:3:1 phenotypic ratio. What proportion of the F2 plants are expected to be heterozygous for both traits?
A.   9/16 (nine sixteenth)
B.   1/16 (one sixteenth)
C.   1/4 (One fourth)
D.   1/2 (one half)
Question #2
The physical basis for the segregation of alleles when gametes are formed is
A.   crossing over during prophase
B.   separation of sister chromatids during anaphase I followed by separation of homologous chromosomes during anaphase II
C.   separation of homologous chromosomes during anaphase I followed by separation of sister chromatids during anaphase II
D.   separation of two strands of DNA during DNA replication
Question #3
According to Mendel's Principle of Independent Assortment, __________
A.   the two alleles controlling a given trait remain discrete - they neither blend with nor alter each other
B.   dominant alleles assort independently of recessive alleles.
C.   each individual has two alleles controlling a given trait
D.   each pair of alleles segregates independently of the other allele pairs
Question #4
RFLPs can be used to tell the diffference between individual DNA samples because ________
A.   each human's DNA shares long, identical sequences
B.   some DNA is more hydrophobic than others
C.   each person's DNA is slightly differen
D.   centromeres and telomeres contain numerous repeats
Question #5
Bacteria can produce restriction enzymes without damaging their own cells because ___________
A.   viral and bacterial DNA are structurally distinct
B.   restriction enzymes cut RNA
C.   restriction enzymes are very specific
D.   restriction enzymes can only cut viral DNA

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