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GregorMendel
MonohybridCrosses
Dihybrid Crosses Sex-Linked Pedigrees
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Pea plants can be observed to be tall, medium, or short
in height?TRUE or FALSE
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FalseMendel found different traits do not blend
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Mendel obtained his F1 generation by the result of:
a. cross-pollination among parents and the next generation
b. cross-pollination between individuals of the parental p generation
c. bees pollinating the parental generationd. crosses between the offspring of a
parental cross
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b. cross-pollination between individuals of the parental p generation
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What are Mendel’sthree laws and explain
them.
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1. The Law of Dominance2. The Law of Segregation3. The Law of Independent Assortment
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If two heterozygous tall pea plants are crossed, what percentage of the F1
generation would be expected to have a short pea plant phenotype?
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25%
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Red coat colour in cats is produced by the homozygous genotype HRHR, blue coat color by the genotype HBHB, and
purple by the genotype HRHB. What kind of interaction is this known as, and what would be the phenotypic ratio of a
mating between two purple cats?
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1 Blue: 1 Red: 2 PurpleIncomplete Dominance
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Two parents are crossed to produce an offspring with type O blood. The genotypes of
the parents could be:
A) AA × ABB) Ai × AB C) BB × iiD) AB × iiE) Bi × Bi
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Bi x Bi
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Refer to the illustration above the box labeled “X” represents the phenotype __________
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Round, yellow
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In a certain plant, the alleles A, B, and C are dominant to the alleles a, b, and c. A
plant with the genotype AABbcc will have the same phenotype as the plant with the
genotype _____.
A) aabbcc B) AaBBccC) AAbbcc D) AABBCc
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AaBBcc
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In humans, dark hair is dominant over blonde hair and curly hair is dominant over straight hair. A woman
with dark, curly hair marries a man with blonde, curly hair. The woman is heterozygous for both traits and
the man’s father has straight hair. What is the probability as a percent that they will have a child
with blonde, straight hair?
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12.5%
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A sex-linked recessive gene n produces colour-blindness in humans. The normal gene is represented by the letter N. Give the genotype for a. a man who is normal. b. a female carrier. c. a man who is colour-blind.
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a. XNYb. XNXn
c. XnY
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If a woman was not colour blind and her father was
colour blind, what would be her genotype?
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XNXn
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Can a colour blind woman and a normal male have colour-
blind daughters? Colour blind Sons?
Explain your answer.
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Daughters: NoSons: Yes
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In a pedigree what shaperepresents a boy
and what shape representsa girl?
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Square: BoyCircle: Girl
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In the third generation, which are the offspring with the a/a
genotype?
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2,3,5
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What is the genotype of the second person in generation II?
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Aa