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.   1/16 (one sixteenth)
B.   9/16 (nine 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.   separation of sister chromatids during anaphase I followed by separation of homologous chromosomes during anaphase II
B.   crossing over during prophase
C.   separation of two strands of DNA during DNA replication
D.   separation of homologous chromosomes during anaphase I followed by separation of sister chromatids during anaphase II
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 pair of alleles segregates independently of the other allele pairs
D.   each individual has two alleles controlling a given trait
Question #4
RFLPs can be used to tell the diffference between individual DNA samples because ________
A.   centromeres and telomeres contain numerous repeats
B.   some DNA is more hydrophobic than others
C.   each human's DNA shares long, identical sequences
D.   each person's DNA is slightly differen
Question #5
Bacteria can produce restriction enzymes without damaging their own cells because ___________
A.   restriction enzymes are very specific
B.   restriction enzymes can only cut viral DNA
C.   viral and bacterial DNA are structurally distinct
D.   restriction enzymes cut RNA

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