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AP BIO GENETICS QUESTIONS AND ANSWERS

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  • GENETICS
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  • GENETICS

AP BIO GENETICS QUESTIONS AND ANSWERS

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  • September 23, 2024
  • 45
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • GENETICS
  • GENETICS
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40 Multiple choice questions

Definition 1 of 40
My 3-year-old niece twisted her ankle and had to wear an ice pack. She decided to take her
Siamese cat and put an ice pack on her ankle too!! Much to her surprise, the cat's fur on her
ankle turned from white to black! What does this illustrate?

some genes are influenced by the environment

temperature-dependent gene expression


Mrs. Lingo's niece is magic

this is a fictitious story

all of the above

Definition 2 of 40
Which of the following is false, regarding the law of segregation?

it states that each of the two alleles for a given trait segregate into different gametes

it can be explained by the segregation of homologous chromosomes during meiosis

it can account for the 3:1 ratio seen in the F2 generation of Mendel's crosses


it can be used to predict the likelihood of transmission of certain genetic diseases within
families


it is a method that can be used to determine the number of chromosomes in a plant

,Definition 3 of 40
A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail
length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from
this organism?

HT


Hh

HhTt


T

tt

Definition 4 of 40
The ABO blood group system

incomplete dominance

multiple alleles

pleiotropy

epistasis

Definition 5 of 40
A tall plant is crossed with a short plant, and the progeny are all intermediate in size between
the two parental plants.


If the intermediate F1 progeny were allowed to self-pollinate and 25% of the F2 progeny were
tall, 50% were intermediate in size, and 25% were short, this would suggest

incomplete dominance

polygenic inheritance

complete dominance


pleiotropy

multifactorial inheritance

,Definition 6 of 40
Feather color in budgies in determined by two different genes Y and B. YYBB, YyBB, or YYBb is
green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.


A blue budgie is crossed with a white budgie. Which of the following results is not possible?


A. green offspring


B. yellow offspring


C. blue offspring


D. A and B


E. A, B and C

e


d

b

c

Definition 7 of 40
It was important that Mendel examined not just the F1 generation in his breeding experiments,
but the F2 generation as well, because

he obtained very few F1 progeny, making statistical analysis difficult

parental traits that were not observed in the F1 reappeared in the F2, suggesting that the
traits did not truly disappear in F1

analysis of the F1 progeny would have allowed him to discover the law of segregation,
but not the law of independent assortment

the dominant phenotypes were visible in the F2 generation, but not in the F1

all of the above

, Definition 8 of 40
A woman and her spouse both show the normal phenotype for pigmentation, but both had
one parent who was an albino. Albinism is an autosomal recessive trait.


What is the probability that their first child will be an albino?

0

1/4


1/2

3/4

1

Definition 9 of 40
When crossing a homozygous recessive with a heterozygote, what is the chance of getting an
offspring with the homozygous recessive phenotype?

0%

25%

50%


75%

100%

Definition 10 of 40
In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a
homozygous tall plant, what is the probability that the offspring will be short?

1/2

1/4

0

1


1/6

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