Answer:
Chromosome number variation: B. Down syndrome
Loss-of-function allele : D. PKU
Physiological trait
: E. Lactose metabolism
Discovery-based science
: A. Human Genome Project
Genetic cross: C. Model organism
Explanation:
Down syndrome is a condition in which there is an extra copy of the chromosome number 21. Hence, it is a chromosome number variation.
Physiological traits refers to any function of a body. Hence, it matches with lactose metabolism.
Human Genome Project was a project under which the whole genome of the humans were sequenced. Hence, it is a discovery based science.
A genetic cross is made between model organisms to test for the offsprings that would be produced from a cross. Hence, genetic cross and model organism math with each other.
<span>The unifying principles of virology are: All viruses are made of a nucleic acid molecule in a protein coat, all viruses are incapable of replicating themselves and must infect a host cell to do so, and all viruses must have genomes that provide mechanisms for them to work.</span>
Deciduous forest biomes has four types of seasons: summer, winter, spring and autumn. The wood frog lives in the deciduous forests successfully because of the following adaptations that it has: it has the ability to adapt to very cold climates. During winter, the frog freezes up, it stops breathing and its heart stop beating. The frog usually produce an anti-freeze substance which prevents ice from freezing within its cells. When the weather becomes warm, the frog thaw up and begin feeding and mating again.
Introns are the noncoding DNA .
