Penn Foster - Biology Lesson 3, Genetics and Inheritance, Exercise & Self-Check Answer Key Questions With Complete Solutions

Penn Foster - Biology Lesson 3, Genetics and
Inheritance, Exercise & Self-Check Answer
Key Questions With Complete Solutions


PENN FOSTER
Sections 1-4
PART 1: Exercise Assignments (94 Q&A)
PART 2: Self-Check Quiz (27 Q&A)
PART 3: EXAM (20 Q&A)
(NOTE: Remember to Paraphrase Any Answers with
Drawn-out Explanations)
→ 6 QUESTIONS ←
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1. Tall pea plants are dominant, while short plants
are recessive. In a cross between a purebred tall
plant and a purebred short plant, the offspring will
all be _______ plants. Correct Answers tall (or
heterozygous)

→ 7 QUESTIONS ←
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1. A genetic mutation causes disease when the
_______ the DNA encodes is altered such that it no
longer functions properly. Correct Answers protein

→ 7 QUESTIONS ←

,◻◻◻
1. A genomic sequencing method called _______
sequencing was used in the human genome
project. In this method, DNA is broken into many
small fragments and the fragments are sequenced,
then computers help reassemble the fragments
into the larger DNA sequence. Correct Answers
shotgun

→ 7 QUESTIONS ←
◻◻◻
1. A/n _______ is a family tree used to study the
inheritance of a trait in humans. Correct Answers
pedigree

→ 7 QUESTIONS ←
◻◻◻
1. Chargaff's rule states that the amount of _______
in DNA is always roughly equal to the amount of
thymine and that the amount of guanine in DNA is
always roughly equal to the amount of cytosine.
Correct Answers adenine

→ 7 QUESTIONS ←
◻◻◻
1. DNA replication takes place during the _______
portion of the cell cycle. Correct Answers
interphase

→ 7 QUESTIONS ←

,◻◻◻
1. In RNA, the nucleotide _______ is used in place of
thymine in DNA. Correct Answers uracil

→ 7 QUESTIONS ←
◻◻◻
1. The codon for the amino acid _______ doubles as
the start codon. Correct Answers methionine

→ 7 QUESTIONS ←
◻◻◻
1. The two strands of the DNA double helix are held
together by _______ bonds between base pairs.
Correct Answers hydrogen

→ 7 QUESTIONS ←
◻◻◻
1. To form a multicellular organism, a zygote must
divide many times in a process called _______.
Correct Answers cell proliferation

→ 8 QUESTIONS ←
◻◻◻
1. An organism is _______ for a gene if it has two
copies of the same allele for the gene. Correct
Answers homozygous

→ 8 QUESTIONS ←
◻◻◻

, 1. Punnett squares can be used to depict crosses
involving two factors, also called _______. Correct
Answers dihybrid crosses

→ 9 QUESTIONS ←
◻◻◻
1. The central dogma of molecular biology states
that DNA is _______ into mRNA, which is then
translated into polypeptides. Correct Answers
transcribed

1. The role of rRNA in gene expression is to...

○ A. base pair with DNA strands.
○ B. initiate DNA replication.
○ C. silence genes that shouldn't be expressed.
○ D. form part of the ribosome. Correct Answers
ANSWER:
The role of rRNA (Ribosomal RNA) in gene
expression is to... D. form part of the ribosome.

REFERENCE:
3.3 Determine the information flow from DNA to
RNA to direct the synthesis of proteins
DNA, RNA, and the Development of Multicellular
Organisms READING ASSIGNMENT
◦◦◦
"Ribosomal RNA, also called rRNA, is part of the
ribosome..." (PDF pg. 70 & 100)
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