Project #40285 - Homework II

Homework II

Answer all questions by either highlighting the correct choice, filling in the blank provided, or completing the highlighted tables. Please return the answered exam as a MSWORD document; no other format is accepted.  YOU must put your name in the file name when you submit the answered homework:  an example:  SmithJ_HWII.doc !.

 

1)    The essence of meiosis is that

a)    gametes receive one copy of each pair of homolog chromosomes.

b)    diploid cells are formed.

c)     each gamete receives a pair of homologous chromosomes.

d)    Gametes are formed with 2n chromosomes.

e)    each gamete receives one member of each pair of homologous                                          chromosomes, and haploid gametes are formed.

2)    There are _____ molecules of DNA in a developing human ovum at the beginning of prophase I

a)    92

b)    23

c)     46

d)    half as many(as compared to somatic cells)

e)    twice as many ( as compared to mature sperm)

3)    In comparing mitosis and meiosis, which of the following statements is true?

a)    Meiosis I is more like mitosis than is meiosis II.

b)    Both processes result in four cells

c)     Pairing of homologues occurs in both

d)    Chromatids are present only in mitosis

e)    Meiosis II resembles mitosis

4)    A gene locus is:

a)    a recessive gene

b)    the location of an allele on a chromosome

c)     a sex chromosome

d)    the location of an allele on a gene

e)    a dominant gene

5)    The most accurate description of an organism with genotype AaBb is:

a)    heterozygous dominant

b)    homozygous

c)     homozygous dominant

d)    homozygous recessive

e)    heterozygous


 

6)    For Mendel’s explanation of inheritance to be correct,

a)    the genes for the traits he studied have to be located on the same chromosome.

b)    genes cannot be transmitted independently of each other. 

c)     the combination of gametes at fertilization has to be due to chance.

d)    only diploid organisms demonstrate inheritance patterns.

e)    none of these apply.

7)    An X-linked carrier is a

a)    homozygous dominant female

b)    heterozygous male

c)     homozygous recessive female

d)    homozygous female

e)    heterozygous female

8)    The sex chromosome composition of a person with Kleinfelter’s syndrome is

a)    XXX

b)    XO

c)     XXY

d)    XYY

e)    none of these

9)    Gel electrophoresis separates the DNA fragments according to

a)    their length

b)    their mass

c)     their speed of travel through the gel

d)    the number of nucleotides in the fragment

e)    all of these

10)A genetic locus that is analyzed in many forensic and paternity testing laboratories is the human leukocyte antigen locus known as HLA-DQ alpha. There are four major alleles at this locus known as A, B, C, D. How many different genotypes are possible for these four alleles?

a)    8

b)    10

c)     12

d)    16

e)    24

11)Heritable units of information about traits are called:

 

12)A homozygous recessive where “A” represents the trait has two recessive alleles symbolized by:

 

13)The polymerase chain reaction (PCR) uses __FILL IN THE BLANK______ and a heat resistant DNA polymerase to rapidly increase the number of molecules of a DNA fragment.

14)_________ can reveal the order of nucleotide bases in a fragment of DNA.

 

15)An X-linked recessive gene (c) produces red-green color blindness.  A             normal woman whose father was color-blind marries a color-blind man.

a)    What are the possible genotypes for the mother of the color-blind man?

 

b)    What are the possible genotypes for the father of the color-blind man?

 

c)     What are the chances that the first son with be color blind?

 

d)    What are the chances that the first daughter will be color-blind?

 

16)There are three alleles controlling ABO blood types, IA and IB are codominant genes. IAIB produces AB blood type.  The third allele IO (also written as “i”) is recessive to the other two alleles.  Indicate which of these parents could produce the given child?

Parent Bloodtypes

Child Bloodtype

Possible? (Yes or No)

A X AB

B

 

A x O

A

 

A x AB

O

 

AB x AB

A

 

17)In humans, brown eyes (B) are dominant over blue (b). A brown-eyed man marries a blue-eyed woman and they have three children, two are brown-eyed and one is blue-eyed.

a)    Complete the highlighted Punnett square with missing genotypes that illustrate this marriage?

 

Brown Eyed Man Allele One

Brown Eyes Man Allele two

Blue-eyed Woman Allele One

 

 

Blue eyed Woman Allele Two

 

 

b)    What is the man’s genotype?

 

c)     What are the genotypes of the children?

Brown eyed children:

Blue eyed child:

 


 

18)Below is a table of frequencies of alleles based on racial ancestry for the locus CSF1PO. Here we are given three groupings – CAU, AA, and HIS. The number proceeding each category is the number of individuals information gathered. Alleles are listed beginning with 5 and ending with 15.2. Blanks indicate that none of the individuals tested had the particular allele.

 

 

 

 

 

 

 

 

 

 

 

a)    Calculate the number of individuals that have the 14 allele in all three groups?

 

b)    What is frequency that an allele not be Allele 13 in CAU individuals?

 

19)What is the probability that a CAU will be homozygous for allele 11?

 

20)    Using the following DNA sequence, identify the following below: CGCAAATCT

A.Write the complementary DNA strand:

B.Write the mRNA strand:

C.Write the tRNA anti-codon sequence:

D.Write the amino acid sequence:

21)    A chromosome has the following sequence: ABCDEFG. Define the mutation type seen below:

a.ABABCDEFG

b.ABCDEABFG

c.ABCFEDG

 

Subject Science
Due By (Pacific Time) 09/21/2014 06:21 am
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