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AP BIO UNIT 5 AND 6 EXAM
Terms in this set (15)
For sexually reproducing diploid parent cells, which of the following statements best explains the production of haploid cells that occurs in meiosis but not in mitosis?
Separation of chromatids occurs once, and there are two rounds of cell division in meiosis.
In anaphase I of meiosis, cohesion between the centromeres of sister chromatids is maintained while homologous chromosomes migrate to opposite poles of the cell along the meiotic spindle. A compound that prevents the separation of the homologous chromosomes in anaphase II is being studied. Which of the following questions can be best answered during this study?
Is there a pattern to the movement of homologous chromosomes in the presence of this compound?
A model of crossing over during gamete formation in shown in Figure 1. Based on Figure 1, which of the following questions can best be addressed?
Does synapsis of homologous chromosomes in the parent cell contribute to an increase in genetic diversity in the daughter cells?
Researchers performed a dihybrid cross of coffee bean plants to investigate whether the inheritance of two traits (height and stem circumference) follows Mendel's law of independent assortment. The data for the F2 generation are presented in Table 1. Which of the following is closest to the calculated chi-square value for the data presented in Table 1?
Researchers hypothesized that red eye color in Japanese koi, a type of fish, is due to a mutation. To study the inheritance of the red eye color in koi, the researchers conducted breeding experiments over several generations. The results are summarized in Figure 1. Based on the data in Figure 1, which of the following is the best prediction of the mode of inheritance of red eyes in Japanese koi?
The allele for red eyes is inherited in an autosomal dominant pattern.
Himalayan rabbits are a breed of rabbits with highly variable fur color. If genetically similar rabbits are raised in environments that have different temperature conditions, the rabbits can have different color fur patterns. Which of the following statements best explains how the fur color can be different in Himalayan rabbits raised under different temperature conditions?
The environment determines how the genotype is expressed.
Several members of a family are found to involuntarily sneeze when exposed to bright lights, such as sunlight. Following analysis of the condition in the family, a doctor predicts the symptoms have an underlying genetic basis. For this condition, which of the following modes of inheritance is most consistent with the observations?
Sex chromosomes determine the phenotype of sex in humans. Embryos containing XX chromosomes develop into females, and embryos containing XY chromosomes develop into males. The sex chromosomes separate during meiosis, going to different gamete cells. A woman is heterozygous for the X-linked recessive trait of hemophilia. Her sex chromosomes can be designated as XHXh. During meiosis the chromosomes speratae as shown in Figure 1. If the woman and a man with normal clotting function have children, what is the probability of their children exhibiting hemophilia A?
50 percent for sons, 0 percent for daughters.
Which of the following best explains how the pattern of DNA arrangement in chromosomes could be used, in most cases, to determine if an organism was a prokaryote or eukaryote?
Prokaryotic DNA- Single circular chromosome
Eukaryotic DNA- Multiple linear chromosomes
Lynch syndrome is an inherited condition associated with an increased risk for colon cancer, as well as certain other cancers. Mutations in one of several genes involved in DNA repair during DNA replication have been associated with Lynch Syndrome DNA sequencing was performed for an individual. The results indicated that the individual carries one of the dominant alleles that has been associated with Lynch Syndrome. Which of the following best explains how the results should be interpreted?
Retroviruses such as HIV and hepatitis B virus use RNA as their genetic material rather than DNA. In addition, they contain molecules of reverse transcriptase, an enzyme that uses an RNA template to synthesize complementary DNA. Which of the following best predicts what will happen when a normal cell is exposed to a retrovirus?
The reverse transcriptase will produce DNADNA from the viral RNARNA, which can be incorporated into the host's genome and then transcribed and translated.
Figure 1 depicts a simplified model of a replication bubble. Which of the following best explains how this model illustrates DNA replication of both strands as a replication fork moves?
I is synthesized continuously in the 5′ to 3′ direction, and III is synthesized in segments in the 5′ to 3′ direction.
Nucleotide base pairing in DNA is universal across organisms. Each pair (T-A; C-G) consists of a purine and pyrimidine. Which of the following best explains how the base pairs form?
Hydrogen bonds join a double-ringed structure to a single-ringed structure in each pair.
Based on the information provided in Figure 1 and Figure 2, which of the following best predicts the effects of a mutation in the promoter of the TYR gene that prevents it from being transcribed?
Skin pigmentation will not be able to change, resulting in a negative selection pressure.
Which of the following claims best explains why keratinocytes do not produce melanin?
Keratinocytes do not express the MITF gene.
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