Question

main idea: genes influence the development of traits.

1. genotype and phenotype differ. use the statements below to fill in the

definition and an analogy for each one in the table.
a. the observable traits of an organism.
b. the underlying genetics of an organism.
c. a person’s thoughts that you can’t read.
d. a person’s words that tell you what they’re thinking about.

	definition	analogy
phenotype

fill in the blank with the word or phrase that best completes the sentence.

1. alleles are represented on paper by letters. uppercase letters

indicate ____________ alleles, and lowercase letters indicate
____________ alleles.

1. an organism’s phenotype is affected both by alleles and by ____________.

complete the table by filling in the following terms: dominant, recessive, tt, tt.

genotype	phenotype	alleles
homozygous recessive	10.	tt
heterozygous	11.	12.

vocabulary check
fill in the blank with the word or phrase that best completes the sentence.

1. an organism with a qq genotype has ____________ alleles.
2. an alternative form of a gene is called an ____________.
3. the opposite of homozygous is ____________. the opposite of

dominant is ____________.

Explanation:

Question 6

For Genotype: The definition is the underlying genetics (statement b), and the analogy is a person’s unreadable thoughts (statement c) as genotype is internal/underlying. For Phenotype: The definition is observable traits (statement a), and the analogy is a person’s words (statement d) as phenotype is observable.

In genetics, uppercase letters represent dominant alleles (they mask recessive ones), and lowercase represent recessive alleles (masked by dominant in heterozygous).

Phenotype is influenced by genetic (alleles) and environmental factors (like diet, temperature, etc. affecting trait expression).

Answer:

	Definition	Analogy
Phenotype	a. The observable traits of an organism.	d. A person’s words that tell you what they’re thinking about.

Question 7