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Transcript
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TRAITS, GENËS, AND ALLELËS
6.4
Study Guide
KEY CONCEPT
VOGABULARY
Gene¡ encode protelns that
produce a diverse range of
g0n0
heterozygous
phenotype
allele
gen0me
dominant
homozygous
genotype
recessive
traits.
MAIN IDEA¡ The same geue
t.
can have many verston¡.
What is the relationship between a gerie and a protein?
2. What is an allele?
env of the alternative formn of â trânê thal mav
3. rilhat
at a soeclflc locus
term describes a pair of alleles that are the same? that are different?
homozvoous: heterozvoous
4.
lVrite
a
definition of homologous chromosomes using the terms "gene" and "allele."
Homologous chromosomes are two chromosomes, one from the mother and one from the father, that have
the same length, overall appearanc€, and gones, although the alleles may dlffer.
ïn the space belou draw a pair of homologous chromosomes. Label the ohromosomes with
two sets of genes, one with homozygous alleles (Gene A, Gene A) and one with heterozygous
alleles (Gene B, Gene b).
cGt
lmages should be similar to the Vlsual Vocab on pg, 180
in the textbook. Students will label Gene A, Gene A, gene B,
and Gene b.
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Unit 3 Resource Book
McDougal Litte ll Biology
Study
Guide 13
Name
Pertod
Date
STUDY GUIDE, CONTINUED
IUIAIN
IDEA:
Genes lnfluence the development of traits.
5, Write an analogy to show the difference
between genot)?e and phenotype.
Answers will
Samole answer: oenotvoe ig the underlvino oonetics of an
compared to someone's thoughts that you can't read.
which could be
6. How are alleles represented on paper?
as lFtters. uf'frercase for dominantSlleles and þwgfease for reses8jye allelqs
7. Fill in the table below with the missing genot'rye, phenotype (dominant or recessive), or
alleles (TT, Tt, tt).
Genotype
homozygous dominant
homozygous recessive
heterozygous
8. If
domlnant
r0cessNe
dominant
Allelo¡
TT
tt
Tt
an organism has a recessive trait, can you determine its genotype for that trait?
Yes. it has to be
9.
Phenotype
recessive.
What factors besides alleles affect phenotype?
environment. such as n
ic
o
o
and sunsh¡n€
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Vocabulary Gheck
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1O, What type of alleles are present in an organism with a QQ genotype?
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hnmnzvnar¡e r{nminanl
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11. What is an alternative form of a gene?
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J
allala
12. What
ôoo
ã
is the opposite of homozygous? of dominant?
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14
Study Guide
Unit 3 Resource Book
McDougal Littell Biology
