1A) What do Mendel's 3:1 ratios tell us? Select one: a. that natural selection is true. b. that recombination is rare. c. that blending inheritance is false. d. that mutation is common. e. that genetic experiments are misleading. 1B) Which of the following could cause natural selection (cause one trait to spread in population relative to alternative traits)? Select one: a. a predator's hunting strategy b. the physical attributes of food c. climate d. preferences of the opposite sex e. All of the above are correct. 1C) Which of the following is a true statement? Select one: a. Even if a new allele would be adaptive, natural selection cannot create it. b. Children with the same two parents are likely to be genetically identical; their differences are largely environmental. c. Sex cells (eggs and sperm) have twice as many genes as the adults who produced them. d. Mixing together of maternal and paternal genetic material during meiosis is pathological and produces maladaptive outcomes. e. None of the above is true.
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This ratio is observed when two heterozygous individuals (having one dominant and one recessive allele) are crossed. The 3:1 ratio represents the probability of offspring inheriting the dominant trait (3 out of 4) versus the recessive trait (1 out of 4). So, the Show more…
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Which of the following will not produce offspring with the recessive phenotype? Select one: a. tt x tt b. Tt x tt c. TT x Tt d. Tt x Tt 2. If you cross two heterozygous parents, Select one: a. all children will be phenotypically dominant b. the children have a 75% chance of being phenotypically dominant c. the children have a 25% chance of being phenotypically dominant d. none of these are true 3. Which of the following is true? Select one: a. The phenotype of an individual refers to the alleles an individual receives at fertilization b. Sister chromatids have one chromosome from the mother and one from the father c. The genotype of an individual refers to the physical appearance d. In a homologous pair of chromosomes, one comes from the mother and one comes from the father. 4. Mendel used green pea plants for experimentation. Which of the following is true? Select one: a. Many true-breeding varieties of plants were available b. Peas are more difficult to grow than some other vegetables c. Pea plants have long generation times d. Pea plants never self-pollinate 5. Huntington's disease is an autosomal dominant disorder. Which of the following statements is false? Select one: a. Affected children will have an affected parent b. Two unaffected parents can have an affected offspring c. Heterozygotes are affected d. Both males and females are affected equally 6. Which of the following statements is NOT true according to Mendel's law of segregation? Select one: a. one factor must be dominant and one factor recessive in each individual b. each individual contains two factors for each trait c. factors separate from each other during the formation of gametes d. each gamete contains only one copy of each factor 7. Cystic Fibrosis is a recessive disorder. Which of the following statements is false regarding autosomal recessive disorders? Select one: a. Heterozygotes are unaffected b. Most affected children have unaffected parents c. Two affected parents will always have affected children d. Males are affected more frequently than females
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1A) Match Mendel's laws with their descriptions. - Law of Segregation - Law of Independent Assortment Group of answer choices: - States that gametes will inherit both copies of a gene - States that two traits are inherited independently from each other - States that a gamete can inherit one of two alleles from the parent 1B) Match Mendel's laws with what happens during meiosis. - Law of Segregation - Law of Independent Assortment Group of answer choices: - Occurs because sister chromatids are pulled apart during meiosis - Occurs because homologous chromosomes migrate and line up independently from each other during meiosis I. - Occurs because homologous chromosomes are pulled apart in meiosis I. 1C) Eye color in fruit flies was one of the first sex-linked traits identified. In flies, the gene for eye color is found on the X chromosome. The red eye allele is dominant (R) and the white eyes allele is recessive (r). Like in humans, male flies are XY and female flies are XX. If you crossed a red eye male (XRY) with a heterozygous female (XRXr), what percent of male flies is expected to have white eyes?
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