front 1 What do we mean when we use the terms monohybrid cross and dihybrid cross | back 1 A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid cross involves only one. |
front 2 Why did the F₁ offspring of Mendel's classic pea cross always look like one of the two parental varieties? | back 2 One phenotype was completely dominant over another. |
front 3 What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? | back 3 Traits are inherited in discrete units, and are not the results of "blending." |
front 4 How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE? | back 4 8 |
front 5 Which of the following differentiates between independent assortment and segregation? | back 5 The law of independent assortment requires describing two or more genes relative to one another |
front 6 A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism? | back 6 HT |
front 7 Mendel accounted for the observation that traits which had disappeared in the F₁ generation reappeared in the F₂ generation by proposing that | back 7 traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F₁. |
front 8 Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following? | back 8 His reading of the scientific literature current in the field. |
front 9 Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? | back 9 anaphase I of meiosis |
front 10 Mendel's second law of independent assortment has its basis in which of the following events of meiosis I? | back 10 alignment of tetrads at the equator |
front 11 Which of the following describes the ability of a single gene to have multiple phenotypic effects? | back 11 pleiotropy |
front 12 Which of the following is an example of polygenic inheritance? | back 12 skin pigmentation in humans |
front 13 Which of the following provides an example of epistasis? | back 13 In rabbits and many other mammals, one genotype (cc) prevents any fur color from developing |
front 14 The frequency of heterozygosity for the sickle-cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following | back 14 Darwin's explanation of natural selection |
front 15 One of two major forms of a human condition called neurofibromatosis (NF 1) is inherited as a dominant gene, although it may range from mildly to very severely expressed. If a young child is the first in her family to be diagnosed, which of the following is the best explanation? | back 15 One of the parents has very mild expression of the gene. |
front 16 A woman who has blood type A positive has a daughter who is type O
positive and a son who is type B negative. Rh positive is a trait that
shows simple dominance over Rh negative and is designated by the
alleles R and r, respectively. A third gene for the MN blood group has
codominant alleles M and N. | back 16 IBi |
front 17 A woman who has blood type A positive has a daughter who is type O
positive and a son who is type B negative. Rh positive is a trait that
shows simple dominance over Rh negative and is designated by the
alleles R and r, respectively. A third gene for the MN blood group has
codominant alleles M and N. | back 17 IAi |
front 18 A woman who has blood type A positive has a daughter who is type O
positive and a son who is type B negative. Rh positive is a trait that
shows simple dominance over Rh negative and is designated by the
alleles R and r, respectively. A third gene for the MN blood group has
codominant alleles M and N. | back 18 B positive |
front 19 A woman who has blood type A positive has a daughter who is type O
positive and a son who is type B negative. Rh positive is a trait that
shows simple dominance over Rh negative and is designated by the
alleles R and r, respectively. A third gene for the MN blood group has
codominant alleles M and N. | back 19 Each parent is either M or MN. |