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

question 37

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.
-Given that these two gene loci are very closely linked,the genotypic ratio in the F₂ generation should be closest to

• A)1:2:1
• B)1:1:1:1
• C)9:3:3:1
• D)3:1

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Definitions:

Social Loafing

The phenomenon where individuals exert less effort to achieve a goal when they work in a group than when they work alone.

Group Polarization

The tendency for group members' opinions to become more extreme (either stronger or weaker) after group discussions.

Bystander Effect

A social psychological phenomenon in which individuals are less likely to offer help to a victim when other people are present.

Diffusion of Responsibility

A phenomenon where individuals in a group are less likely to take action or feel a sense of responsibility because the responsibility is perceived to be shared among all group members.