1993 年
生物 · 共 58 題 · 點擊選項即時核對答案
Which of the following produce offspring with identical genotypes ?
Which of the following is a male secondary sexual characteristic in humans ?
With reference to the above diagram, which of the following characteristics indicates that this flower is adapted to wind pollination ?
The diagram below shows sections of four different fruits :
Which of the above fruits carry seeds that are dispersed by animals ?
Questions 47 to 49 refer to the table below which shows the phenotypes and genotypes of two mice (X and Y). A is the gene for black coat and A’ is the gene for white coat.
| Mouse X | Mouse Y | |
|---|---|---|
| Phenotype | black coat | white coat |
| Genotype | AA | AA’ |
Which of the following statements is incorrect ?
Questions 47 to 49 refer to the table below which shows the phenotypes and genotypes of two mice (X and Y). A is the gene for black coat and A’ is the gene for white coat.
| Mouse X | Mouse Y | |
|---|---|---|
| Phenotype | black coat | white coat |
| Genotype | AA | AA’ |
If A’ resulted from a mutation of gene A, the mutation is most likely to have taken place in
Questions 47 to 49 refer to the table below which shows the phenotypes and genotypes of two mice (X and Y). A is the gene for black coat and A’ is the gene for white coat.
| Mouse X | Mouse Y | |
|---|---|---|
| Phenotype | black coat | white coat |
| Genotype | AA | AA’ |
In a population of mice, it is found that 80% of the mice are black-coated and 20% are white-coated. Which of the following shows the probable changes in the percentages of black mice and white mice in the following environments after one year ?
| Dark leafy area: Black mice | Dark leafy area: White mice | White sandy area: Black mice | White sandy area: White mice | |
|---|---|---|---|---|
| 90% | 10% | 70% | 30% | |
| 70% | 30% | 90% | 10% | |
| 90% | 10% | 90% | 10% | |
| 70% | 30% | 70% | 30% |
Alice and Betty are twins who developed from two different fertilized eggs and were brought up in different countries. The twins are now 20 and Alice is taller and heavier than Betty. The difference between the two sisters may be due to the fact that :
An oak woodland consists of the following organisms in each trophic level : 1st trophic level : oak trees 2nd trophic level : insects and spiders 3rd trophic level : snakes and lizards 4th trophic level : birds Which of the following shows the relative number of organisms in each trophic level in the woodland ?
When a large amount of nitrogenous fertilizer leaches into a stream, which of the following graphs shows the likely changes in the populations of algae and bacteria along the stream ?
