Crossing a heterozygous parent with a homozygous recessive parent should produce a ratio of dominant-to-recessive phenotypes of approximately _____.
A) 1:1
B) 2:1
C) 3:1
D) 9:3:3:1
Answer: A) 1:1
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A purine or pyrimidine that differs in chemical structure from those normally found in DNA or RNA is called a(n) ____________________
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. Bacterial cells always contain one copy of a circular chromosome. 2. Bacteria can exchange DNA between strains of the same species and between different species. 3. Viroids have a genome but do not translate any of it to protein. 4. All forms of horizontal gene transfer require both the recipient and donor bacteria to be alive.
Anindividual who does not produce bile has the most trouble digesting ____
a. carbohydrates
b. proteins c. fats d. nucleic acids e. essential vitamins
Which of these situations regarding phloem sources and sinks is not correct?
A. During autumn, deciduous tree roots would be a sink. B. Young leaves are sinks. C. The root of a carrot plant is a source. D. In a seedling, the cotyledons would be sources. E. A growing pumpkin is a sink.