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Genetics
| Question | Answer |
|---|---|
| Which of the following is an example of polygenic inheritance? | Skin pigmentation in humans |
| Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest? | That the parents were both heterozygous for a single trait. |
| What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female? | 2:1 male to female |
| The Barr body is: | The inactivated X chromosome in females. |
| Which of the following statements is true of linkage? | The closer the two genes are on a chromosome, the lower the probability that a crossover will occur between them. |
| A person with type AB blood would have ___ antigens on red blood cells, and produce ___ antibodies. | A and B; neither anti-A nor anti-B |
| One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome. What is this alteration called? | Translocation |
| A child is diagnosed with a rare genetic disorder. Neither parent has the disorder. How might the child have inherited the disorder? | The disorder is recessive and carried by both parents. |
| The fact that all seven of the pea plants traits studied by Mendel obeyed the principle of independent assortment most probably indicates which of the following? | All the genes controlling the traits behaved as if they were on different chromosomes. |
| They rarely live past their 20s. How likely is it for a woman to have this condition? | A woman would very rarely have this condition; it is rare that an affected male would mate with a carrier female. |
| According to figure 12-5, what is the chance that individual A will be afflicted with Huntington’s? | 50% |
| If the unknown is heterozygous, half of the offspring will have the ___ phenotype. | Dominant, recessive |
| Males are more often affected by sex-linked traits than females because: | Males are hemizygous for traits on the X chromosome. |
| In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? | 0 |
| Mendel’s observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? | Anaphase 1 of meiosis |
| What is the order of these genes on a chromosome map? | b-rb-cn-vg |
| What is the probability that the next child of parents A and B would have had sickle cell anemia? | 25% |
| A rearrangement in the linear sequence of genes as shown in the diagram above is known as: | Inversion |
| An individual with genotype AaBbCCDdEE can make multiple kinds of gametes. Which of the following is the major reason? | different possible assortment of chromosomes into gametes. |
| Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this? | pleiotropy |
| What kind of offspring would you expect from the cross of a black female cat and an orange male. | Tortoise shell females; black males |
| Which of the following crosses would produce offspring in the ratio of 1 red: 2 roan: 1 white? | Roan x roan |
| Remarkably, all the white-eyed flies were male. What was the explanation for this result? | The gene involved is on the X chromosome. |
| Sex is determined in bees and ants by whether or not the egg is fertilized. This is known as: | The haplo-diploid system |
| What advantages foes chorionic villi sampling have over amniocentesis as a preventive fetal testing method for genetic disorders? | It can be done sooner in the pregnancy. |
| According to the table above, which of the following phenotypes would probably occur in all the offspring from the genotypes of the parents shown above? | Green eyes |
| Which method of preventive fetal testing is considered noninvasive with no risk and is therefore performed routinely? | Ultrasound |
| Between which two genes would you expect the highest frequency of recombination? | A and G |
| Which of the following calculations require that you utilize the addition rule? | Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both. |
| What is the probability of producing Aabbccdd from a cross between AaBbCcDd and aaBbccDd? | 1/64 |
| The phenotype of individual C is best explained by the fact that this individual received an allele for sickle cell anemia from: | An autosomal chromosome of each parent |
| A woman who has blood type A has a daughter who is type O and a son who is type B. Which of the following is a possible genotype for the father? | I^Bi |
| Analyze the following karyotype. This patient: | has Turner syndrome. |
Created by:
Jeevana