In Drosophila,the Allele Red Eyes (Bw+)is Dominant to the Allele

question 16

Multiple Choice

In Drosophila,the allele red eyes (bw+) is dominant to the allele for brown eyes (bw) .At another gene locus on the same chromosome,the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv) .Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F₁ progeny.
-What is the relationship between recombination frequency and the actual physical distance on a chromosome?

• A)As physical distance increases,the recombination frequency increases in a linear fashion.
• B)As physical distance increases,the recombination frequency decreases in a linear fashion.
• C)As physical distance increases,the recombination frequency first increases in a linear fashion,but gradually levels off to a frequency of 0.5.
• D)As physical distance increases,the recombination frequency first increases,but then decreases.

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Definitions:

Bx

A shorthand notation for biopsy, a medical test involving the extraction of sample cells or tissues for examination.

Surgical Removal

The process of excising or taking out a body tissue, organ, or tumor through an operation, often to treat disease or injury.

Examination

A detailed inspection or analysis of an object or person, especially for medical purposes.

IRT

Initial Response Team, a group of professionals, typically in emergency services, who respond first to a scene of incident.