Matthew800
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A disease-resistant variety of a sexually reproducing crop was planted on a field with an existing nonresistant variety. After a few years, pests severely attacked the plants. The older, nonresident plants died. However, the recently grown plants survived. Why did the new plants survive?

The pests can't attack the new plants.
The new plants had the resistant gene.
The old plants were covered with low-grade insecticides.
The new plant variety was younger than the intital plants.
The recently grown plants had an increased life span.

Respuesta :

Slipknot
The new plants had the resistant gene. 

Answer:

The correct answer would be "The new plants had the resistant gene".

Disease resistance variety of a crop is usually produced by introducing a foreign gene into the crop. This gene protects the crop and provides resistance against particular pathogen or pest. It enables the crop to produce substances which toxic to a particular or group of pests but has no effects on humans and animals.

For example, Bt crops which are produced by introducing a gene from bacterium Bacillus thuringiensis. These crops are resistant to a wide variety of pests such as bollworm

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