All the following regarding maternal effect genes are true except
1. It is located in the nuclear DNA.
2. Maternal genotype affects offspring phenotype.
3. It may control deposition of material into oocytes.
4. It must be located on the X chromosome.

Which of the following will demonstrate crossing over?
1. A fly that received only y+w+m+ and ywm chromosomes from her parents was able to transmit different combinations of alleles to her offspring.
2. A fly with a gray body and red eyes (wild type) was able to produce offspring with gray bodies and white eyes.
3. True breeding yellow, white, miniature flies always had yellow, white, miniature offspring.
4. None of these examples demonstrate crossing over.

Gross large chromosomal aberrations can be rapidly identified by
1. Karyotype analysis.
2. Genetic studies.
3. Pedigree analysis.
4. DNA fingerprinting

Lateral gene transfer in bacteria is facilitated by direct contact in?
1. Conjugation.
2. Transduction.
3. Transformation.
4. Transfection

In geranium, self-polination of plants with red flowers results in 1/4 red, 2/4 pink and 1/4 white flowered plants. This is most likely due to
1. The soil in which the pink plant was growing was deficient in a critical nutrient.
2. The pink plant had a new mutation, creating an allele to which the wild type "red" is incompletely dominant.
3. The pink plant had a new mutation, creating an allele which is incompletely dominant to red.
4. The pink plant had a new mutation, creating an allele which is codominant to "red".

Eukaryotic genes are split genes with coding and non-coding sequences. A mutation leads to deletion of all coding sequences in a gene. The resultant allele would be called as
1. Lethal
2. Dominant
3. Loss of function
4. Sex-limited

Heterozygotes for cystic fibrosis had a survival advantage during plague epidemics. This can be explained by
1. Multiple alleles
2. Overdominance
3. Environmental influence
4. Epistasis

With successive divisions, the telomeres get shortened. This is explained by the fact that
1. Only pieces of DNA with centromeres are correctly sorted into daughter nuclei during mitosis.
2. Only pieces of DNA with telomeres are correctly sorted into daughter nuclei during mitosis.
3. This piece of DNA is recognized as foreign by the cell.
4. 1 and 2.

The chromosomal aberration ‘duplication’ is best described as:
1. The presence of an extra copy of an existing chromosome.
2. The presence of an entirely new piece of chromosomal material.
3. The presence of an extra copy of a piece of chromosomal material.
4. The result of chromosomal material exchanged between two chromosomes.

 

Chromosomal aberrations include:
I. Duplication
II. Inversion
III. Translocation
IV. Deletion

1. I, II, & III only
2. I, III & IV only
3. II, III & IV only
4. I, II, III & IV