Genetics, an important branch of biology, is best defined as:
1. | The study of the transmission of traits from parent to offspring. |
2. | The study of genes and traits defined by genes. |
3. | The study of DNA. |
4. | The study of variation between members of a species. |
Pedigree analysis rather than conventional methods are used to study genetic traits because:
I: | Number of progeny is limited |
II: | Choice matings are not possible |
III: | Sexual dimorphism is seen in humans |
The genetic change shown in the given figure shows the pathogenesis of:
1. | Phenylketonuria | 2. | Cystic fibrosis |
3. | Sickle cell anemia | 4. | Thalassemia |
Total number of autosomes will be the same in:
I. | Male and female humans |
II. | Male and female birds |
III. | Male and female Drosophila |
IV. | Male and female grasshopper |
1. Only I, II, and III
The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:
1. | it revealed new and unanticipated features of Mendel’s pea plant varieties. |
2. | it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. |
3. | it allowed scientists to see the DNA present within chromosomes. |
4. | it led to the discovery of mitochondria. |
The number of autosomes in a human egg would be:
1. | 22 | 2. | 23 |
3. | 1 | 4. | 2 |
It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:
1. | The sex is determined by the type of sperm fertilizing the egg |
2. | The sex is determined by the type of egg fertilizing the sperm |
3. | The sex is determined by the hormones produced by the fetus |
4. | The sex is determined by God’s Will |
In Phenylketonuria,
I: | Phenylpyruvic acid and other derivatives are accumulated in the brain resulting in mental retardation. |
II: | These are also excreted through urine because of their poor absorption by the kidney. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both are correct | 4. | Both are incorrect |
Which of the following was not a character studied by Mendel in garden pea?
1. | Flower position | 2. | Pod shape |
3. | Flower colour | 4. | Pod position |
Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
1. | Violet flower colour | 2. | Yellow pod colour |
3. | Axial flower position | 4. | Tall stem height |