Q. No.Identify the incorrect statement regarding a sex limited trait:
1. This term refers to a trait controlled by a gene located on the X or Y chromosomes.
2. This is a trait that occurs more frequently in one sex than another.
3. This is an extreme example of a sex influenced trait.
4. This trait is likely to be a secondary sex characteristic.
1. This term refers to a trait controlled by a gene located on the X or Y chromosomes.
2. This is a trait that occurs more frequently in one sex than another.
3. This is an extreme example of a sex influenced trait.
4. This trait is likely to be a secondary sex characteristic.
What is the essential difference between chromosomes in a prokaryotic and a eukaryote?
1. Eukaryotes are diploid while prokaryotes are haploid.
2. Al DNA in prokaryotes is in cytoplasm and in eukaryotes in nucleus
3. Eukaryotes have linear chromosomes while most prokaryotes contain a single circular chromsome.
4. No packaging of DNA occurs in prokaryotes and DNA is packaged only in eukaryotes
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 consequences of F factor mediated conjugation in bacteria is:
1. both strains are F+.
2. transfer of complete bacterial chromosome.
3. conversion of the recipient strain to F+ and the donor to F-.
4. both strains are F-
What would be the correct explanation of ‘segregation’ in Mendelian genetics?
| 1. | Genes are inherited in discrete units from one generation to the next. |
| 2. | Genes can exist in different forms, known as alleles. |
| 3. | Homologous chromosomes separate during gamete formation. |
| 4. | Genes on different chromosomes are inherited independently. |
The results of a dihybrid cross deviate significantly from the expected 9:3:3:1 ratio. This is because
1. Your plant was faulty
2. The plant can only be self- pollinated in nature
3. You picked two genes that are linked and thus do not assort independently.
4. The genes involved show blending inheritance.
All the following statements regarding lethal allele are true except
1. Lethal alleles are always recessive.
2. Lethal alleles may have a late age of onset.
3. Lethal alleles may be caused by mutations in essential genes.
4. Lethal alleles may affect one individual differently than another.
Inactivation of X-chromosome as a part of dosage compensation will be characterized by all the following except
1. The process is entirely random.
2. X inactivation may occasionally occur in males.
3. This process ensures a homogenous phenotype in heterozygotes.
4. X inactivation occurs early in embryonic development.
Gene ‘dosage’ effect can explain all the following except:
1. Males with one normal allele for the X linked gene dystrophin are unaffected, while females (who shut off one of their two X chromosomes) with one normal allele for dystrophin may be mildly affected with muscular dystrophy.
2. Flower color in four-o-clocks seems to be incompletely dominant.
3. In fruit flies, homozygotes for an allele that produces a small amount of functional protein are severely abnormal but survive to adulthood, while homozygotes for an allele that produces no protein at all die as embryos.
4. In bees, males normally are haploid while females normally are diploid.
Identify the correct statements regarding linked genes:
| I. | are located near each other on the same chromosome. |
| II. | violate the law of independent assortment. |
| III. | segregate together during meiosis. |
| 1. | I & II only | 2. | I & III only |
| 3. | II & III only | 4. | I, II & III |
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