Dextral (D) and Sinistral (D) Shell Coiling in the Water

question 24

Multiple Choice

Dextral (D) and sinistral (d) shell coiling in the water snail Limnaea peregra is genetically determined. From a population of mixed sinistral and dextral snails, a sinistral female and a dextral male are chosen. All the offspring are dextral. When the female offspring are mated, 50% produce only sinistral snails and the other 50% produce only dextral snails.
-What were the genotypes of the sinistral female and dextral male that were initially chosen?

• A)dd female and Dd male
• B)Dd female and dd male
• C)dd female and DD male
• D)DD female and dd male
• E)Dd female and Dd male

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Definitions:

Across The Line

Refers to a method of starting electric motors where the motor is directly connected to the power line, resulting in full line voltage being applied.

Full Voltage

A term typically referring to the application of full line voltage to a device, ensuring it operates at its intended performance level.

Electrical Supply

Refers to the source and infrastructure involved in delivering electricity from the production point to the consumer.

Electric Motors

Machines that convert electrical energy into mechanical energy, commonly used in various applications from household appliances to industrial machinery.