Animal Biotechnology Chromosomes – Section 1

1. An odd number of cross overs in the inverted region will result into formation of a dicentric chromatid and acentric chromatid at anaphase I incase of

A. pericentric inversion
B. paracentric inversion
C. double inversion
D. none of these

Correct Answer: B. paracentric inversion

2. The percentage of the individual with a given genotype, which exhibits the associated phenotype, is defined as

A. penetrance
B. expressivity
C. inheritance percent
D. environmental influence

Correct Answer: A. penetrance

3. Diethylstilbestrol (DES), a synthetic estrogen causes

A. chromosome lagging
B. disruption of mitotic spindle
C. centriole elongation
D. all of the above

Correct Answer: D. all of the above

4. Bar eye character of Drosophila is due to

A. duplication in region of 16A of X chromosome
B. deletion in region of 16A of X chromosome
C. due to presence of additional X-chromosome
D. due to a point mutation in eye-locus

Correct Answer: A. duplication in region of 16A of X chromosome

5. Transmission of a gene from male parent to female child to male grandchild is known as

A. holandric inheritance
B. quantitative inheritance
C. criss-cross inheritance
D. maternal inheritance

Correct Answer: C. criss-cross inheritance

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