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RIO BIO 156 EXAM 2 ACTUAL EXAM 250 QUESTIONS
AND CORRECT DETAILED ANSWERS ALREADY GRADED
A+ BEST RATED EXAM JUST RELEASED
Solve this monohybrid genetics problem: Black hair is governed by the dominant gene (B) and blond hair is determined by the recessive gene (b). In this monohybrid cross, if both parents are heterozygous, what percentage of the offspring would be expected to have blond hair?
- 75%
- 50%
- 100%
- 25%
- 33.3% - ANSWER-d. 25%
A pair of chromosomes that are similar in length, shape, and the traits they govern are called ___.
- diploid chromosomes
- mitotic chromosomes
- homologous chromosomes
- germ chromosomes
- homozygous chromosomes - ANSWER-c. homologous chromosomes
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A monohybrid cross is:
- the second generation of a self-fertilization plant.
- a breeding experiment in which the parental varieties have only one trait in common.
- a breeding experiment in which the parental varieties differ only in one trait.
- a triploid plant that results from breeding two very different plants.
- None of the choices are correct - ANSWER-c. a breeding experiment in which the parental
varieties differ only in one trait.
In multicellular organisms, mitosis is ___.
- the means of tissue growth and repair
- a way of generating new kinds of mutant or recombinant organisms
- the means of sexual reproduction
- not useful in stem cell lines that constantly replace skin, etc.
- able to occur in only a few cells of specialized tissues - ANSWER-a. the means of tissue
growth and repair
Which sequence of stages in mitosis is correct?
- prophase, anaphase, metaphase, telophase
- prophase, telophase, anaphase, metaphase 2 / 4
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- prophase, metaphase, anaphase, telophase
- telophase, anaphase, prophase, metaphase
- anaphase, metaphase, prophase, telophase - ANSWER-c. prophase, metaphase, anaphase,
telophase
What is the importance of crossing-over?
- It provides extra genetic material for the daughter cells.
- It increases the likelihood that daughter cells contain different genetic material.
- It produces the proteins that are associated with DNA in chromosomes.
- It increases chromosomes condensation.
- It separates the homologous chromosomes. - ANSWER-b. It increases the likelihood that
daughter cells contain different genetic material.
Different alleles of the same gene are found:
- at the same place on mitochondrial chromosomes.
- at different places on homologous chromosomes.
- at the same place on homologous chromosomes.
- throughout the chromosomes at different places.
- in different individuals on different chromosomes. - ANSWER-c. at the same place on
homologous chromosomes. 3 / 4
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Which occurs in metaphase?
- Centrioles move to opposite poles
- Chromosomes line up along the equator of the dividing cell.
- Chromosomes move to opposite poles.
- The nuclear envelope disappears.
- The nuclear envelope forms. - ANSWER-b. Chromosomes line up along the equator of the
dividing cell.
If a parental cell has 12 chromosomes, then each of the daughter cells following meiosis will have ___.
- 48 chromosomes
- 24 chromosomes
- 12 chromosomes
- 6 chromosomes
- 4 chromosomes - ANSWER-d. 6 chromosomes
In a Mendelian monohybrid cross, which generation is always completely heterozygous?
- F1 generation
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