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. |
What is the critical difference between genetic transfer in bacteria and sexual reproduction?
1. | In genetic transfer, genetic material is transferred from one individual to another. |
2. | In sexual reproduction, genetic material from two individuals is mixed equally. |
3. | In both processes, the individual donating genetic material retains their original complement of genetic material. |
4. | None of these. |
Which of the following statements regarding ‘gene’ will be correct?
I. | Can be described as a unit of heredity. |
II. | Contains information to produce a particular protein. |
III. | Affects traits at the cellular level. |
IV. | Can exist in many forms. |
The correct statements include:
1. | I, II, and III only | 2. | II, III, and IV only |
3. | I, III, and IV only | 4. | I, II, III, and IV |
The number of recessive traits in a garden pea in the list given in the box below is:
dwarf stem height, wrinkled seed shape, yellow seed color; yellow pod color, inflated pod shape, terminal flower position, violet flower color |
1. | 2 | 2. | 3 |
3. | 4 | 4. | 5 |
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. |
What decides the frequency of an allele in a population?
1. | Dominance |
2. | Its location on a particular chromosome |
3. | Its degree of expression |
4. | Natural selection |
Column I | Column II | ||
A | Homozygous | P | having two different alleles of a particular gene or genes |
B | Heterozygous | Q | having two identical alleles of a particular gene or genes |
C | Homologous | R | not having the same alleles or genes in the same order of arrangement |
D. | Heterologous | S | having the same alleles or genes in the same order of arrangement |
A | B | C | D | |
1. | P | Q | R | S |
2. | S | R | Q | P |
3. | Q | P | S | R |
4. | P | Q | S | R |