Genetics Review

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Genetics Review
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• Which of the below represents a trait?
• Eye color
• Type A blood
• Rr

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• Which of the below represents a trait?
• Eye color
• Type A blood
• Rr

4

• An allele that expresses itself in a heterozygous
  individual is a
• dominant allele
• dihybrid
• pedigree
• recessive allele

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• An allele that expresses itself in a heterozygous
  individual is a
• dominant allele
• dihybrid
• pedigree
• recessive allele

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• Which of the below represents a genotype?
• Eye color
• Type A blood
• Rr

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• Which of the below represents a genotype?
• Eye color
• Type A blood
• Rr

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• Different versions of a gene are known as ____.
• Traits
• Phenotypes
• Genotypes
• Alleles

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• Different versions of a gene are known as ____.
• Traits
• Phenotypes
• Genotypes
• Alleles

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• An organism with two different alleles for a
  single gene is
• Homozygous
• Heterozygous
• Phenotypic
• Genotypic

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• An organism with two different alleles for a
  single gene is
• Homozygous
• Heterozygous
• Phenotypic
• Genotypic

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• An organism with the genotype RR is called
• Homozygous recessive
• Heterozygous
• Homozygous dominant

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• An organism with the genotype RR is called
• Homozygous recessive
• Heterozygous
• Homozygous dominant

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• The appearance of an organism is its
• Genotype
• Phenotype
• Genotypic ratio
• Karyotype

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• The appearance of an organism is its
• Genotype
• Phenotype
• Genotypic ratio
• Karyotype

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• Which of the following genotypes is heterozygous?
• RR
• Rr
• rr

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• Which of the following genotypes is heterozygous?
• RR
• Rr
• rr

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• Which of the below represents a phenotype?
• Eye color
• Blonde hair
• Rr

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• Which of the below represents a phenotype?
• Eye color
• Blonde hair
• Rr

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• Which of the following genotypes is homozygous
  recessive?
• RR
• Rr
• rr

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• Which of the following genotypes is homozygous
  recessive?
• RR
• Rr
• rr

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• A cross that is written RrGg x RrGg is an
  example of a
• Monohybrid cross
• Dihybrid cross
• Pedigree
• Co-dominance

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• A cross that is written RrGg x RrGg is an
  example of a
• Monohybrid cross
• Dihybrid cross
• Pedigree
• Co-dominance

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• In the cross that is written RrGg x RrGg what
  are the four possible genotypes for gametes
  produced by the first parent?

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• In the cross that is written RrGg x RrGg what
  are the four possible genotypes for gametes
  produced by the first parent?
• RG, Rg, rG, rg

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• A monohybrid cross of two individuals that are
  heterozygous for a trait exhibiting simple
  dominance would produce a phenotypic ratio of
• 4 dominant 0 recessive
• 3 dominant 1 recessive
• 1 dominant 3 recessive
• 1 dominant 1 recessive

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• A monohybrid cross of two individuals that are
  heterozygous for a trait exhibiting simple
  dominance would produce a phenotypic ratio of
• 4 dominant 0 recessive
• 3 dominant 1 recessive
• 1 dominant 3 recessive
• 1 dominant 1 recessive

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• In a dihybrid cross between an individual with
  the genotype RRYY and an individual with the
  genotype rryy, all of the offspring will have the
  genotype
• RRYY
• RrYY
• RrYy
• rryy

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• In a dihybrid cross between an individual with
  the genotype RRYY and an individual with the
  genotype rryy, all of the offspring will have the
  genotype
• RRYY
• RrYY
• RrYy
• rryy

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• In pea plants, tall plants are dominant to short
  plants. If two heterozygous tall plants are
  crossed, what percent of the offspring will be
  short?
• 25
• 50
• 75
• 100

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• In pea plants, tall plants are dominant to short
  plants. If two heterozygous tall plants are
  crossed, what percent of the offspring will be
  short?
• 25
• 50
• 75
• 100

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• Albino individuals lack all pigmentation so that
  their hair and skin are white. This family tree
  shows that albinism
• a. is carried only by females in this family
• b. is a recessive trait
• c. is a sex-linked gene
• d. requires both parents to be albinos

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• Albino individuals lack all pigmentation so that
  their hair and skin are white. This family tree
  shows that albinism
• a. is carried only by females in this family
• b. is a recessive trait
• c. is a sex-linked gene
• d. requires both parents to be albinos

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• Two spotted leopards produce a litter of four
  cubs. Three of the cubs are spotted and one is
  solid black. The black coat is probably what type
  of trait?
• Dominant
• Recessive
• Co-dominant
• Sex-linked

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• Two spotted leopards produce a litter of four
  cubs. Three of the cubs are spotted and one is
  solid black. The black coat is probably what type
  of trait?
• Dominant
• Recessive
• Co-dominant
• Sex-linked

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• If a cross is made between a pure-breeding
  green, round (yyRR) plant and a pure-breeding
  yellow, wrinkled (YYrr) plant, what is the
  result? Use a Dihybrid Punnett square to help
  you!!!
• all green, wrinkled peas
• all yellow, round peas
• all yellow, wrinkled peas
• none of the above

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• If a cross is made between a pure-breeding green
  round (yyRR) plant and a pure-breeding yellow
  wrinkled (YYrr) plant, what is the result? Use a
  Dihybrid Punnett square to help you!!!
• all green, wrinkled peas
• all yellow, round peas
• all yellow, wrinkled peas
• none of the above

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• According to the pedigree below, the trait being
  studied earlobes is ________ .
• Dominant
• Recessive
• Could be either dominant or recessive

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• According to the pedigree below, the trait being
  studied earlobes is ________ .
• Dominant
• Recessive
• Could be either dominant or recessive

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• What is the sex of this organism?

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FEMALE

• What is the sex of this organism?

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• What is the sex of this organism?

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MALE

• What is the sex of this organism?

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• What disorder does this person have and what
  event caused it?

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This person has Down Syndrome, also known as
Trisomy 21, as result of non-disjunction of
homologous chromosomesduring meiosis

• What disorder does this person have and what
  event caused it?