Genetics Exam test questions and
answers graded A+
T or F
A gene with 8 distinct alleles can produce 72 genotypes. - ANS✅✅False
T or F
Curt Lively found that snails with rare genotypes were more resistant to common parasite
genotypes. - ANS✅✅True
T or F
Crossing over between sister chromatids produces recombination during meiosis. - ANS✅✅False
T or F
The typical mendelian ration for a dihybrid cross is 9:3:3:3. - ANS✅✅False
Assuming complete dominance, a tetrahybrid ( heterozygous at four loci) cross can produce how
many different phenotypes? - ANS✅✅8
A mating between an individual with the dominant phenotype and an unknown genotype to an
individual with the recessive phenotype is a..... - ANS✅✅test cross
In the ABO blood group, A is dominant to: - ANS✅✅O
The location of a gene on the chromosome is - ANS✅✅the locus
Members of a homologous pair of chromosomes may have different .... - ANS✅✅alleles
In a monohybrid cross between tall and dwarf pea plants, the number of offspring in each category
may not be in a ratio of exactly 3:1 because of: - ANS✅✅random error
, Which of the following is added to the terminal sugar of the H structure of a person who is blood
type A? - ANS✅✅N-acetylgalactosamine
Yellow seed color (Y) is dominant to green (y) and round seed shape (R) is dominant to wrinkled (r).
What genotype produce yellow, wrinkled seeds? - ANS✅✅Yyrr and YYrr
Dihybrid summer squash bred together produce a ratio of 12 white to 3 yellow to 1 green squash in
the offspring. This is an example of ....... - ANS✅✅dominant epistasis
If a tetrahybrid plant (heterozygous at four loci) is self-fertilized, what proportion of its offspring will
be homozygous dominant at all four loci? - ANS✅✅1/256
Albinism, or lack of pigmentation in humans, results from an autosomal recessive gene in humans. A
male with genotype Aa marries an albino female. What is the probability that they will have five
normal children? - ANS✅✅1/32
After crossing two strains of cabbage plant, one green and one yellow, you find the first generation
offspring are all green. In the F2, you find 87 green plants and 28 yellow plants. What mode of
inheritance best explains your results? - ANS✅✅Complete dominance
In meiosis, separation of the homologous pairs occurs during - ANS✅✅Anaphase I
Mitosis occurs between which phases in the cell cycle? - ANS✅✅G2 and G1
How many different genotypes are possible from a cross between two pea plants that are
heterozygous at 8 different loci? - ANS✅✅6,561
What is the order of phase in Mitosis? - ANS✅✅Prophase, metaphase, Anaphase, Telophase
During meiosis, the nucleoprotein complex that holds non-sister chromatids of a homologous pair
together during crossing over is the - ANS✅✅synaptonemal complex
Short tailed mice crossed with long tailed mice produce a ratio of 1 short to 1 long. Crossing the
short tailed offspring typically produces a ration of 2 short tailed to 1 long tailed. This is probably an
example of: - ANS✅✅a dominant lethal allele
answers graded A+
T or F
A gene with 8 distinct alleles can produce 72 genotypes. - ANS✅✅False
T or F
Curt Lively found that snails with rare genotypes were more resistant to common parasite
genotypes. - ANS✅✅True
T or F
Crossing over between sister chromatids produces recombination during meiosis. - ANS✅✅False
T or F
The typical mendelian ration for a dihybrid cross is 9:3:3:3. - ANS✅✅False
Assuming complete dominance, a tetrahybrid ( heterozygous at four loci) cross can produce how
many different phenotypes? - ANS✅✅8
A mating between an individual with the dominant phenotype and an unknown genotype to an
individual with the recessive phenotype is a..... - ANS✅✅test cross
In the ABO blood group, A is dominant to: - ANS✅✅O
The location of a gene on the chromosome is - ANS✅✅the locus
Members of a homologous pair of chromosomes may have different .... - ANS✅✅alleles
In a monohybrid cross between tall and dwarf pea plants, the number of offspring in each category
may not be in a ratio of exactly 3:1 because of: - ANS✅✅random error
, Which of the following is added to the terminal sugar of the H structure of a person who is blood
type A? - ANS✅✅N-acetylgalactosamine
Yellow seed color (Y) is dominant to green (y) and round seed shape (R) is dominant to wrinkled (r).
What genotype produce yellow, wrinkled seeds? - ANS✅✅Yyrr and YYrr
Dihybrid summer squash bred together produce a ratio of 12 white to 3 yellow to 1 green squash in
the offspring. This is an example of ....... - ANS✅✅dominant epistasis
If a tetrahybrid plant (heterozygous at four loci) is self-fertilized, what proportion of its offspring will
be homozygous dominant at all four loci? - ANS✅✅1/256
Albinism, or lack of pigmentation in humans, results from an autosomal recessive gene in humans. A
male with genotype Aa marries an albino female. What is the probability that they will have five
normal children? - ANS✅✅1/32
After crossing two strains of cabbage plant, one green and one yellow, you find the first generation
offspring are all green. In the F2, you find 87 green plants and 28 yellow plants. What mode of
inheritance best explains your results? - ANS✅✅Complete dominance
In meiosis, separation of the homologous pairs occurs during - ANS✅✅Anaphase I
Mitosis occurs between which phases in the cell cycle? - ANS✅✅G2 and G1
How many different genotypes are possible from a cross between two pea plants that are
heterozygous at 8 different loci? - ANS✅✅6,561
What is the order of phase in Mitosis? - ANS✅✅Prophase, metaphase, Anaphase, Telophase
During meiosis, the nucleoprotein complex that holds non-sister chromatids of a homologous pair
together during crossing over is the - ANS✅✅synaptonemal complex
Short tailed mice crossed with long tailed mice produce a ratio of 1 short to 1 long. Crossing the
short tailed offspring typically produces a ration of 2 short tailed to 1 long tailed. This is probably an
example of: - ANS✅✅a dominant lethal allele
