The calculated chi-square value is 3.91, and the critical value is 7.82. The null hypothesis cannot be rejected.
Categoría: Ap Bio Unit 5: MCQ progress check
Which of the following best explains how the leaves from the same plant can have different stomatal densities when exposed to an elevated carbon dioxide level?
Leaf growth is promoted through increased photosynthesis, but the genetically regulated rate of stomatal production is not altered, leading to a decrease in stomatal density.
Researchers performed a dihybrid cross with 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 (χ2) value for the data presented in Table 1? 72.01
Which of the following questions would be most useful to researchers trying to determine the role of meiosis in the F2 phenotypic frequencies?
What is the recombination frequency between the genes for petal shape and pollen shape?
In pea plants, purple flower color is dominant to red flower color and long pollen grains are dominant to round pollen grains. Researchers crossed two pure-breeding lines of the pea plants to investigate whether the genes controlling flower color and pollen shape segregate independently. The procedure for the genetics experiment is summarized in Figure 1. Figure 1. Summary of a genetics experiment using pea plants Which of the following tables best shows the expected values in the F2 generation for a chi-square goodness-of-fit test for a model of independent assortment?
Phenotype Expected Purple, long 1199 Purple, round 400 Red, long 400 Red, round 133
Huntington’s disease has been traced to the number of CAG repeats in the HTT gene, which is located on chromosome 4. The phenotypic influence of individual alleles with different numbers of repeats is shown in Table 1. Which of the following is most likely the immediate cause of the first appearance of Huntington’s disease in a person?
An allele with more than 39 CAGCAG repeats was inherited by the affected person.
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.
Which of the following best explains how the sweet pea plants in the parental generation produce F1 offspring with 14 chromosomes?
Meiosis 2 and 3 lead to the formation of cells with 7 chromosomes. During meiosis II, homologous chromosomes separate. During meiosis IIII, sister chromatids separate. Two cells combine during fertilization to produce…
Which of the follow indicates the mean number per cross of F2 plants producing medium-red grain and correctly explains the distribution of the phenotypes?
The mean number of medium-red phenotypes per cross is 20.8. The distribution of phenotypes suggests that multiple genes are involved in grain color determination.