A male has a defect in the X chromosome of the 23rd pair. As children, people with this syndrome experience symptom that can range from mild to severe or even profound intellectual disability. This is known as .

The correct answer is: Fragile X Syndrome.

Explanation:

Fragile X Syndrome is a genetic condition that has an X-linked dominant inheritance, which means that this disorder is carried in a gene in the X chromosome (23rd pair) and will affect any child with one allele.

Given that males only get one X chromosome, while females get two, this condition tends to affect males on a deeper level.

People with Fragile X Syndrome suffer from intellectual disability (the average IQ in males is under 55), characteristic physical features such as a long and narrow face, big protruding ears, flexible fingers and large testicles. Autism and hyperactivity are also common.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.