Traits and the Environment

Which one of the following could be described as one of your traits?

• the color of your shirt

• the color of your eyes

• what type of movies you like

• what state you live in

How long have people been observing the inheritance of traits?

• since the 1860s

• since 1951

• for the last 20 years

• for thousands of years.

Genes contain instructions that direct the synthesis of specific __________.

• chromosomes

• traits

• DNA

• proteins

An organism's phenotype depends on its genotype and the __________ effect on that genotype.

• chromosome's

• environment's

• protein's

• DNA's

Which one of the following is affected by internal environmental influences?

• development of human brain cells

• the shape of an apple

• the thickness of tree leaves

• flower color in hydrangea plants

Several pine trees with the same genotype are planted in a forest. At the end of five years, one tree is taller than the rest. Why might this be?

• It has different genes.

• It has different DNA.

• It can produce different proteins.

• Its environment is different.

What environmental factor can change the phenotype of a Siamese cat's color markings?

• temperature

• presence of water

• light

• food eaten

Some species of fish, including clown fish, are born with the ability to __________.

• change genotypes

• grow threadlike tails

• change sex

• develop lungs

The science that studies how traits are passed from parents to offspring is called __________.

• natural selection

• ecology

• genetics

• environmental science

What is the name of a model that can be used to predict the outcome of a genetic cross?

• a Punnett square

• a Mendel square

• a Concept map

• an Allele triangle