Biol 4003 Quiz 1 with verified answers
graded A+
True-breeding tall plants with purple flowers are crossed to true-breeding dwarf plants with
white flowers. The F1 plants were tall with purple flowers. The genes that affect these traits
independently assort. If the F1 plants were crossed to dwarf plants with white flowers, the
expected ratio of the F2 generation would be - correct answer ✔✔ 1 tall/white flowers : 1
tall/purple flowers : 1 dwarf/white flowers : 1 dwarf/ purple flowers
Which event during meiosis explains Mendel's law of segregation? - correct answer ✔✔
Separation of homologs during anaphase I of meiosis
Which of the following is a molecular explanation for the effects of a rare allele that is dominant
over the normal (wild-type) allele? - correct answer ✔✔ haploinsufficiency
gain-of-function mutation
dominant negative mutation
Correct Answer
All of the other 3 choices are possible
Red/green colorblindness is an X-linked recessive trait. A mother who is colorblind and a father
with normal vision have a child. Assuming that the child can be male or female, what is the
probability that their child will be a male with red/green colorblindness? - correct answer ✔✔
50%
A heterozygous plant, GgHhIiJjKk is allowed to self fertilize. What is the probability that an
offspring will be GGHhIiJjkk? - correct answer ✔✔ 1/128 = 0.0078
graded A+
True-breeding tall plants with purple flowers are crossed to true-breeding dwarf plants with
white flowers. The F1 plants were tall with purple flowers. The genes that affect these traits
independently assort. If the F1 plants were crossed to dwarf plants with white flowers, the
expected ratio of the F2 generation would be - correct answer ✔✔ 1 tall/white flowers : 1
tall/purple flowers : 1 dwarf/white flowers : 1 dwarf/ purple flowers
Which event during meiosis explains Mendel's law of segregation? - correct answer ✔✔
Separation of homologs during anaphase I of meiosis
Which of the following is a molecular explanation for the effects of a rare allele that is dominant
over the normal (wild-type) allele? - correct answer ✔✔ haploinsufficiency
gain-of-function mutation
dominant negative mutation
Correct Answer
All of the other 3 choices are possible
Red/green colorblindness is an X-linked recessive trait. A mother who is colorblind and a father
with normal vision have a child. Assuming that the child can be male or female, what is the
probability that their child will be a male with red/green colorblindness? - correct answer ✔✔
50%
A heterozygous plant, GgHhIiJjKk is allowed to self fertilize. What is the probability that an
offspring will be GGHhIiJjkk? - correct answer ✔✔ 1/128 = 0.0078
