The number of linkage groups in a plant with a normal diploid number of chromosomes in a somatic cell as 16 will be:
1. 16
2. 8
3. 4
4. It is impossible to tell from the information provided.

Non-disjunction is normally a result of
1. Failure of synapsis in meiosis I.
2. Chromosome breakage.
3. Lack of synapsis in mitosis.
4. Centromere duplication.

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

A dihybrid cross does not give the expected phenotypic ratio in F2 generation. This may be due to
I. Epistasis
II. Multiple genes affecting your trait of interest
III. Linkage
1. I & II only
2. I &III only
3. II & III only
4. I, II & III

What would be true for an allotetraploid species:

I: It contains a complex diploid set from each parent
II: It can produce viable gametes
III: It may be important in agriculture
1. I & II only
2. I & III only
3. II & III only
4. I, II & III

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".