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Bio test #4 part 1
| Question | Answer |
|---|---|
| Mendel's understanding of the inheritance of traits in peas, expressed in modern language, included all of the following except | if a given allele is present, its effects will be seen in the individual. |
| Sometimes one gene pair will interact so as to control the expression of a second gene pair in an interaction called | epistasis. |
| Yellow-seeded plants might be homozygous or heterozygous. We could find out which by crossing these plants with | true breeding green-seeded plants. |
| The allelic make up of an individual is referred to as its | genotype. |
| One of the main reasons genes assort independent of one another is that | they are on different chromosomes. |
| As a genetic counselor, you are constructing a human pedigree for a particular disease. You note that every generation shows the trait, suggesting that it is | dominant. |
| If an individual allele has more than one effect on the phenotype it is said to be | pleiotropic. |
| Mendel's first law encompasses all of the following except | all genes found in an individual are not separable into gametes. |
| Let R = red pigment and r = no pigment. In carnations, RR offspring make a lot of red pigment, rr offspring make no pigment and Rr offspring make a small amount of red pigment, thus appearing pink. Pink carnations are therefore an example of | incomplete dominance. |
| In a heterozygous individual the allele being expressed is | dominant. |
| Let P = purple flowers and p = white, and T = tall plants and t = dwarf. Of the 16 possible gamete combinations in the dihybrid cross, how many would be the phenotype white, tall? | 3 |
| When Mendel crossed two purple-flowered pea plants with each other, he obtained a phenotypic ratio of 3:1 (purple-flowered pea plants to white-flowered pea plants). His results are consistent with which of the following sets of parents? | heterozygous purple pea plant and heterozygous purple pea plant |
| The allelic make up of an individual is referred to as its | genotype. |
| Let P = purple flowers and p = white, and T = tall plants and t = dwarf. What combinations of gametes could be produced by a heterozygote for both the traits? | PT, pt, pT, pt |
| The white eye mutation in Drosophila was shown to be sex-linked and caused by a gene residing on chromosome | X. |
| Which of the following animals is a genetic male? | grasshopper XO |
| Huntington's disease is caused by an autosomal dominant allele. It is a lethal disease, but it persists in the human population. Which of the following statements best describes why? | Huntington's disease presents symptoms in humans after many have already reproduced; therefore, they are unaware that they passed on Huntington's disease. |
| If a XY individual had a deletion of the SYR gene, they would | develop as a female. |
| In humans, if a non-disjunction event led to an individual with a genotype of XXY, they would | be male because they have a Y chromosome. |
| If a female was a carrier for sex-linked color blindness, what percentage of her male children would also be color blind? | 50% |
Created by:
evie mcintyre