BIO 156 RIO EXAM 2
1. Interphase is the stage when .
Answer a cell grows and duplicates its DNA.
2. In an individual with a dominant phenotype is crossed with an individual with
a recessive phenotype, 4 of their 9 offspring show the recessive phenotype.
What is the genotype of the first parent?
Answer Bb
3. Solve this monohybrid genetics problem
Black hair is governed by the dom- inant 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?
Answer 25%
4. A Punnett square can be used to determine .
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, Answer the genotype of an ottspring
5. Different alleles of the same gene are found
Answer at the same place on homologous chromosomes
6. If a parental cell has 14 chromosomes prior to mitosis, how many chromo-
somes will each daughter cell have?
Answer 14 because the chromatids separate
7. a duplicated chromosome has chromatid(s)
Answer 2
8. Mendel was fortunate to work out the laws of segregation and independent
assortment because he used an organism that reproduced quickly and in which
the traits were discrete (easy to observe). Mendel's organism of choice was
the
Answer pea plant
9. What is the importance of crossing-over?
Answer It increases the likelihood that daughter cells contain ditterent genetic material.
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, 10. Assuming that the probability of having a female child is 50% and the prob-
ability of having a male child is also 50%, what is the probability that a couple's
firstborn child is female and second-born child is male?Answer 25%
11. If a parental cell has 12 chromosomes, then each of the daughter cells
following meiosis will have .
Answer 6 chromosomes.
12. Which of the following genotypes would be homozygous dominant for both
alleles?
Answer DDEE
13. Which sequence of stages in mitosis is correct?
Answer prophase, prometaphase, metaphase, anaphase, telophase
14. During which stage of meiosis does crossing-over occur?Answer prophase I
15. Which occurs in anaphase?
Answer Chromosomes move to opposite poles.
16. If both parents in a dihybrid cross are heterozygous for both traits, the
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1. Interphase is the stage when .
Answer a cell grows and duplicates its DNA.
2. In an individual with a dominant phenotype is crossed with an individual with
a recessive phenotype, 4 of their 9 offspring show the recessive phenotype.
What is the genotype of the first parent?
Answer Bb
3. Solve this monohybrid genetics problem
Black hair is governed by the dom- inant 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?
Answer 25%
4. A Punnett square can be used to determine .
1/
21
, Answer the genotype of an ottspring
5. Different alleles of the same gene are found
Answer at the same place on homologous chromosomes
6. If a parental cell has 14 chromosomes prior to mitosis, how many chromo-
somes will each daughter cell have?
Answer 14 because the chromatids separate
7. a duplicated chromosome has chromatid(s)
Answer 2
8. Mendel was fortunate to work out the laws of segregation and independent
assortment because he used an organism that reproduced quickly and in which
the traits were discrete (easy to observe). Mendel's organism of choice was
the
Answer pea plant
9. What is the importance of crossing-over?
Answer It increases the likelihood that daughter cells contain ditterent genetic material.
2/
21
, 10. Assuming that the probability of having a female child is 50% and the prob-
ability of having a male child is also 50%, what is the probability that a couple's
firstborn child is female and second-born child is male?Answer 25%
11. If a parental cell has 12 chromosomes, then each of the daughter cells
following meiosis will have .
Answer 6 chromosomes.
12. Which of the following genotypes would be homozygous dominant for both
alleles?
Answer DDEE
13. Which sequence of stages in mitosis is correct?
Answer prophase, prometaphase, metaphase, anaphase, telophase
14. During which stage of meiosis does crossing-over occur?Answer prophase I
15. Which occurs in anaphase?
Answer Chromosomes move to opposite poles.
16. If both parents in a dihybrid cross are heterozygous for both traits, the
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