Genetics Exam 1- Final exam

Rochelle T
Quiz by Rochelle T, updated more than 1 year ago
Rochelle T
Created by Rochelle T over 2 years ago
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Just exam 1 questions, all answers so far are A! Need to be changed.

Resource summary

Question 1

Question
Assuming Mendel/s principles, if a heterozygote is test-crossed the genotypic ratios would be:
Answer
  • 1:!
  • 3:!
  • 9:3:3:1
  • 1:1:1:1:1:1:1:1
  • none of the above

Question 2

Question
Assuming Mendel's principles, if a heterozygote is selfed and the phenotypic ratio is 1:2, what could explain this?
Answer
  • incomplete-dominance
  • X-linked inheritance
  • lethal alleles
  • epistasis
  • none of the above

Question 3

Question
Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a pea-comb chicken is corssed with a walnut-comb chicken and the following offspring are produced: 30 walnut, 15 rose, 9 pea and 2 single. What are the probable genotypes of the parents
Answer
  • Rrpp x RrPp
  • RrpP x RRPp
  • RRpp x rrPp
  • rrPp x RrPp
  • none of the above

Question 4

Question
Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a pea-comb chicken is corssed with a walnut-comb chicken and the following offspring are produced: 30 walnut, 15 rose, 9 pea and 2 single. What are all the genotypes from such a cross?
Answer
  • R_P_, R_pp, rrP_, rrpp
  • R_Pp, R_pp, RrPp, rrpp
  • R_Pp, R_pp, rrPp, rrPp
  • rrPp x RrPp
  • none of the above

Question 5

Question
You testcross a pea plant with genotype TtWw. What fraction of the offspring will have the genotype TtWw, assuming Mendel/s principles.
Answer
  • 1/4
  • 1/6
  • 1/8
  • 1/16
  • none of the above

Question 6

Question
How many different gamete are possible from an organism with genotype AABBDd, assuming Mendel's principles?
Answer
  • 1
  • 2
  • 3
  • 4
  • none of the above

Question 7

Question
The phenomenon of heterozygote advantage is seen in Marfan's syndrome.
Answer
  • True
  • False

Question 8

Question
Use the following for 8-10. Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles. What is the probability that their next child has blue hair and is a male?
Answer
  • 1/4
  • 1/8
  • 5/34
  • 9/64
  • none of the above

Question 9

Question
Use the following for 8-10. Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles. What is the probability of getting a green haired alien, then a blue haired alien and then a green haired alien?
Answer
  • 1/4
  • 1/8
  • 5/34
  • 9/64
  • none of the above

Question 10

Question
Use the following for 8-10. Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles. What is the probability of getting only 2 out of 6 aliens with green hair?
Answer
  • 1/4
  • 1/8
  • 5/34
  • 9/64
  • none of the above

Question 11

Question
Mome has blood type B and baby Joe has blood type O. What blood type can the boy's father not have?
Answer
  • Type A
  • Type B
  • Type O
  • Type AB
  • two of the answers are correct

Question 12

Question
Before interphase human germ cells are 2C and 2n, and after the mitotic cell cycle the end products are 2C and n
Answer
  • True
  • False

Question 13

Question
Before interphase human germ cells are 2C and 2n , and after meiosis 1 the end products are
Answer
  • C and n
  • 2C and 2n
  • C and 2n
  • 2c and n
  • none

Question 14

Question
A women who is homozygous for hemophilia has children with a man who has hemophilia. What is the probability that they will have a normal child?
Answer
  • 1/8
  • 1/48
  • 1/3
  • 1/2
  • none of the above

Question 15

Question
A women who is homozygous for hemophilia has children with a man who has hemophilia. What is the probability that they will have an affected daughter?
Answer
  • 1/8
  • 1/48
  • 1/3
  • 1/2
  • none of the above

Question 16

Question
A women who is homozygous for hemophilia has children with a man who has hemophilia. What is the probability that their next three children will have hemophilia?
Answer
  • 1/8
  • 1/48
  • 1/3
  • 1/2
  • none of the above

Question 17

Question
If a female is a heterozygote for a X-linked disease she may show the disease because...
Answer
  • co-dominance
  • of X-chromosome inactivation
  • more females than males are affected
  • of sex-limited traits
  • more males than females are affected

Question 18

Question
18. What is the mode of inheritance for colorblindness? 19. What is the mode of inheritance of maleness? 20. What is mode of inheritance of PKU (phenylktonuria)? Answer the first one and just read the explanation for the answers to 19 and 20.
Answer
  • autosomal recessive
  • X-linked recessive
  • autosomal dominant
  • sex-linked
  • none of the above

Question 19

Answer
  • A
  • B
  • C
  • D
  • E

Question 20

Question
A bald man and a non-bald women have a non-bald son and bald daughter, what is the probability that heir next child will be a non-bald daughter?
Answer
  • 1/4
  • 1/2
  • 3/4
  • 1/8
  • none of the above

Question 21

Question
A gene has 9 alleles in a population. How many different genotypes are possible, assuming Mendel's principles?
Answer
  • 21
  • 45
  • 90
  • 10
  • none of the above

Question 22

Question
In a Chi-squared test, as the value of the X^2 increases, the likelihood/probability of rejecting the null hypothesis -------. Use the a table. Too lazy to post it in here.
Answer
  • Increases
  • Decreases
  • Does not change
  • All of the above

Question 23

Question
In a chi-squared test, if the X^2 value is found at a Probability (p value) of more than 0.05, then you would fail to reject the null hypothesis
Answer
  • true
  • false

Question 24

Question
Two individuals with Huntington's disease want to have a child and you are the genetic counselor. What do you advice them about the probability that they will have an affected child?
Answer
  • 1/4
  • 3/4
  • 1/3
  • 2/3
  • none of the above

Question 25

Question
If a mutation in a gene gives rise to many different unrelated phenotype, this is called:
Answer
  • co-dominance
  • epistasis
  • pleiotrophy
  • two of the above
  • none of the above

Question 26

Question
Human -------- pass their---------to----------
Answer
  • Females/ autosomes/ sons
  • Males/ X chromosome/ sons
  • males/ y chromosomes/ daughters
  • females/ X chromosomes/ sons only
  • two of the answers are correct

Question 27

Question
In a strand of Drosophilia, purple eyes are dominant to yellow eyes and eye color is X-linked. What insects could you cross to ensure 100% purple eyed progeny?
Answer
  • yellow eyed female X purple eyed male
  • purple (homozygous) eyed female X yellow eyed male
  • purple (heterozygous) eyed female X yellow eyed male
  • A and B
  • A and C

Question 28

Question
For Questions 30-33, choose from the following answers. You can use one answer more than once. 30 will be the correct answer for this question. See explanation for 31-33 answers 30. The synaptonemal complex is found in----- 31. The sister chromatide undergo separation during----- 32/ The homologues pair up during------ 33. the homologues separate during------
Answer
  • telophase
  • anaphase 2
  • prophase 1
  • metaphase 2
  • none of the answers are correct

Question 29

Question
Polar microtubules connect with the centromeres.
Answer
  • true
  • false

Question 30

Question
The house fly, Musca domestica, has a haploid chromosome number of 8. How many chromatids should be present in a diploid, somatic, metaphase cell?
Answer
  • 8
  • 16
  • 32
  • 64
  • none of the above

Question 31

Question
Crossing over/recombination occurs during pachytene of Prophase 2.
Answer
  • true
  • false

Question 32

Question
Genes A and B are 20 cM apart and are in replusion. Suppose that a double heterozygote is test-crossed, what percentage of offspring would have the aaBb phenotype?
Answer
  • 12%
  • 20%
  • 30%
  • 40%
  • 24%

Question 33

Question
If the calculated Rf value from a dihybrid testcross was 0.5, then
Answer
  • the genes might be linked
  • the genes are in coupling
  • the genes might not be linked
  • the genes are x-linked
  • two of the above

Question 34

Question
If two genes C and D are linked, then the expected genotypic ratio of progeny after a testcross of a double heterozygote is:
Answer
  • 1:1:1:1:1:1:1
  • 9:3:3:1
  • 1:1:1:1
  • Impossible to predict
  • None of the above

Question 35

Question
In the testcross expeirments, the frequency of recombination between genes a and b is 0.5, between b and c is 0.2, between a and c is 0.3 and between b and d is 0.1. what is the order of all four genes?
Answer
  • c-b-d-a
  • d-b-c-a
  • a-d-c-b
  • b-a-c-d
  • a-b-c-d
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