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Biology 1100 - Principles of Biology » Fall 2019 » Week 10 Quiz

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Question #1

Let Y = yellow and y = green, and R = round and r = wrinkled. You cross YYRR peas 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. 1/2 (one half)

D. 1/4 (one fourth)

Question #2

The physical basis for the segregation of alleles when gametes are formed is ______.

A. separation of the two strands of DNA during DNA replication.

B. crossing over during prophase I.

C. separation of homologous chromosomes during anaphase I followed by separation of sister chromatids during anaphase II.

D. separation of sister chromatids during anaphase I followed by separation of homologous chromosomes during anaphase II.

Question #3

According to Mendel’s Principle of Independent Assortment, _____.

A. each individual has two alleles controlling a given trait.

B. the two alleles controlling a given trait remain discrete – they neither blend with nor alter each other.

C. each pair of alleles segregates independently of the other allele pairs.

D. dominant alleles assort independently of recessive alleles.

Question #4

RFLPs can be used to tell the difference between individual DNA samples because _______.

A. some DNA is more hydrophobic than others

B. each human's DNA shares long, identical sequences

C. centromeres and telomeres contain numerous repeats

D. each person's DNA is slightly different

Question #5

Bacteria can produce restriction enzymes without damaging their own cells because _____.

A. viral and bacterial DNA are structurally distinct

B. restriction enzymes are very specific

C. restriction enzymes cut RNA

D. restriction enzymes can only cut viral DNA

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