Test
Genetics Exam 1- Final exam
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Preguntas del test (35)
1Assuming Mendel/s principles, if a heterozygote is test-crossed the genotypic ratios would be:
- A1:!
- B3:!
- C9:3:3:1
- D1:1:1:1:1:1:1:1
- Enone of the above
2Assuming Mendel's principles, if a heterozygote is selfed and the phenotypic ratio is 1:2, what could explain this?
- Aincomplete-dominance
- BX-linked inheritance
- Clethal alleles
- Depistasis
- Enone of the above
3Comb 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- ARrpp x RrPp
- BRrpP x RRPp
- CRRpp x rrPp
- DrrPp x RrPp
- Enone of the above
4Comb 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?- AR_P_, R_pp, rrP_, rrpp
- BR_Pp, R_pp, RrPp, rrpp
- CR_Pp, R_pp, rrPp, rrPp
- DrrPp x RrPp
- Enone of the above
5You testcross a pea plant with genotype TtWw. What fraction of the offspring will have the genotype TtWw, assuming Mendel/s principles.
- A1/4
- B1/6
- C1/8
- D1/16
- Enone of the above
6How many different gamete are possible from an organism with genotype AABBDd, assuming Mendel's principles?
- A1
- B2
- C3
- D4
- Enone of the above
7The phenomenon of heterozygote advantage is seen in Marfan's syndrome.
- AVerdadero
- BFalso
8Use 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?- A1/4
- B1/8
- C5/34
- D9/64
- Enone of the above
9Use 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?- A1/4
- B1/8
- C5/34
- D9/64
- Enone of the above
10Use 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?- A1/4
- B1/8
- C5/34
- D9/64
- Enone of the above
11Mome has blood type B and baby Joe has blood type O. What blood type can the boy's father not have?
- AType A
- BType B
- CType O
- DType AB
- Etwo of the answers are correct
12Before interphase human germ cells are 2C and 2n, and after the mitotic cell cycle the end products are 2C and n
- ATrue
- BFalse
13Before interphase human germ cells are 2C and 2n , and after meiosis 1 the end products are
- AC and n
- B2C and 2n
- CC and 2n
- D2c and n
- Enone
14A 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?- A1/8
- B1/48
- C1/3
- D1/2
- Enone of the above
15A 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?- A1/8
- B1/48
- C1/3
- D1/2
- Enone of the above
16A 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?- A1/8
- B1/48
- C1/3
- D1/2
- Enone of the above
17If a female is a heterozygote for a X-linked disease she may show the disease because...
- Aco-dominance
- Bof X-chromosome inactivation
- Cmore females than males are affected
- Dof sex-limited traits
- Emore males than females are affected
1818. 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.- Aautosomal recessive
- BX-linked recessive
- Cautosomal dominant
- Dsex-linked
- Enone of the above
19Look at image
- AA
- BB
- CC
- DD
- EE
20A 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?
- A1/4
- B1/2
- C3/4
- D1/8
- Enone of the above
21A gene has 9 alleles in a population. How many different genotypes are possible, assuming Mendel's principles?
- A21
- B45
- C90
- D10
- Enone of the above
22In 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.
- AIncreases
- BDecreases
- CDoes not change
- DAll of the above
23In 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
- Atrue
- Bfalse
24Two 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?
- A1/4
- B3/4
- C1/3
- D2/3
- Enone of the above
25If a mutation in a gene gives rise to many different unrelated phenotype, this is called:
- Aco-dominance
- Bepistasis
- Cpleiotrophy
- Dtwo of the above
- Enone of the above
26Human -------- pass their---------to----------
- AFemales/ autosomes/ sons
- BMales/ X chromosome/ sons
- Cmales/ y chromosomes/ daughters
- Dfemales/ X chromosomes/ sons only
- Etwo of the answers are correct
27In 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?
- Ayellow eyed female X purple eyed male
- Bpurple (homozygous) eyed female X yellow eyed male
- Cpurple (heterozygous) eyed female X yellow eyed male
- DA and B
- EA and C
28For 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------- Atelophase
- Banaphase 2
- Cprophase 1
- Dmetaphase 2
- Enone of the answers are correct
29Polar microtubules connect with the centromeres.
- Atrue
- Bfalse
30The house fly, Musca domestica, has a haploid chromosome number of 8. How many chromatids should be present in a diploid, somatic, metaphase cell?
- A8
- B16
- C32
- D64
- Enone of the above
31Crossing over/recombination occurs during pachytene of Prophase 2.
- Atrue
- Bfalse
32Genes 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?
- A12%
- B20%
- C30%
- D40%
- E24%
33If the calculated Rf value from a dihybrid testcross was 0.5, then
- Athe genes might be linked
- Bthe genes are in coupling
- Cthe genes might not be linked
- Dthe genes are x-linked
- Etwo of the above
34If two genes C and D are linked, then the expected genotypic ratio of progeny after a testcross of a double heterozygote is:
- A1:1:1:1:1:1:1
- B9:3:3:1
- C1:1:1:1
- DImpossible to predict
- ENone of the above
35In 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?
- Ac-b-d-a
- Bd-b-c-a
- Ca-d-c-b
- Db-a-c-d
- Ea-b-c-d
Información
- Descripción
- Just exam 1 questions, all answers so far are A! Need to be changed.
- Autor
- Rochelle T
- Idioma
- English
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