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Bio 156 rio exam 2 With correct answers
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Bio 156 rio exam 2 With correct answers
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Bio 156 rio exam 2 With correct answersInterphase is the stage when __________. - Answer -a cell grows and duplicates its
DNA.
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
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? - Answer -25%
A Punnett square can be used to determine___________. - Answer -the genotype of an
offspring
Different alleles of the same gene are found - Answer -at the same place on
homologous chromosomes
If a parental cell has 14 chromosomes prior to mitosis, how many chromosomes will
each daughter cell have? - Answer -14 because the chromatids separate
a duplicated chromosome has _____ chromatid(s) - Answer -2
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
What is the importance of crossing-over? - Answer -It increases the likelihood that
daughter cells contain different genetic material.
Assuming that the probability of having a female child is 50% and the probability 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%
If a parental cell has 12 chromosomes, then each of the daughter cells following meiosis
will have _____. - Answer -6 chromosomes.
, Which of the following genotypes would be homozygous dominant for both alleles? -
Answer -DDEE
Which sequence of stages in mitosis is correct? - Answer -prophase, prometaphase,
metaphase, anaphase, telophase
During which stage of meiosis does crossing-over occur? - Answer -prophase I
Which occurs in anaphase? - Answer -Chromosomes move to opposite poles.
If both parents in a dihybrid cross are heterozygous for both traits, the expected
phenotypic ratio in the offspring would be - Answer -9:3:3:1
A pair of chromosomes that are similar in length, shape, and the traits they govern are
called ____. - Answer -homologous chromosomes
If a pea plant shows a recessive phenotype, _____. - Answer -it can only be tt
The offspring of a monohybrid testcross would show the genotype(s) _____. - Answer -
Aa and aa
In which kind of cross would you expect to find a ratio of 3:1 among the F2 offspring? -
Answer -monohybrid cross
The F2 offspring of a monohybrid cross would show the genotype(s) ____. - Answer -
AA, Aa, and aa
Which of the following is the phenotypic ratio for a dihybrid cross showing independent
assortment? - Answer -9:3:3:1
During which stage of meiosis does homologue separation occur? - Answer -anaphase
1
Which occurs in metaphase? - Answer -Chromosomes line up along the equator of the
dividing cell.
In multicellular organisms, mitosis is _____. - Answer -the means of tissue growth and
repair
If you had an individual who showed a dominant phenotype and you wanted to find out
if the individual was homozygous or heterozygous, you could do a test cross. You would
cross the unknown with a known - Answer -homozygous recessive
A monohybrid cross is - Answer -a breeding experiment in which the parental varieties
differ in only one trait.
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