Question 1

Match between columns
                        Premises: This disorder is also known as trisomy 21.
This disorder is an autosomal recessive disorder.
This disorder is an X-linked recessive trait.
Gene therapy has been tried recently for this disorder.
This disorder is due to a sex chromosome abnormality probably caused by nondisjunction of sex chromosomes at meiosis.

Accepted Answer

The Answer of hemophilia and AIDS and Down syndrome. and is...

Question 2

Match between columns
                        Premises: A small region of a protein from three species is sequenced and found to be as follows: species X is alanine, glycine, glycine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The difference in the amino acid sequence of species Y is most likely due to ____.
A small region of a protein from three species is sequenced and found to as follows: species X is alanine, valine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The differences in the amino acid sequence of species Z is most likely due to ____.
The nucleotide sequences of homologous regions of DNA of two species is AATGCCCCGTTA and AATGCCCCGCTTA. If this is not the result of a nucleotide base-pair addition, then it is most likely the result of ____.
Homologous sets of genes ABCDEF and AEDCBF are located on homologous chromosomes. Crossing over between them is suppressed because of ____.
Homologous sets of genes ABCDEF and aBCdEF are located on nonhomologous chromosomes. Crossing over between them is suppressed because their locations are the result of ____.

Accepted Answer

The Answer of an addition. and an addition and a is...

Question 3

Match between columns
                        Premises: Following a gene duplication event involving only five loci, how many chromosomes will a human female have?
How many chromosomes does each somatic cell have in a human male who has two X chromosomes?
How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48?
How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)?
The normal sperm cell of a particular species carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?

Accepted Answer

The Answer of 47 and 24 and 46 and 23 is...

Question 4

Selecting the Exception Four of the five answers listed below are conditions caused by chromosomal nondisjunction. Select the exception.

Accepted Answer

Huntington's disorder is a genetic disorder caused by a mutation in a single gene, not by chromosomal nondisjunction.

Question 5

Match between columns
                        Premises: phenylketonuria
Down syndrome
Turner syndrome
hemophilia

Accepted Answer

The Answer of nondisjunction of the sex chromosomes and autosomal is...

Question 6

Match between columns
                        Premises: polyploidy
trisomy
translocation
duplication
monosomy
colchicine
deletion

Accepted Answer

The Answer of inhibits microtubule assembly; prevents chromosome movement and is...

Question 7

Short index fingers (shorter than ring finger) are dominant in males and recessive in females, while long index fingers (as long or longer than ring fingers) are dominant in females and recessive in males. Give the F ₂ genotype and phenotype resulting from the cross of a male with long fingers with a female with short fingers.

Accepted Answer

The answer of Short index fingers (shorter than ring finger)...

Question 8

Selecting the Exception Four of the five answers listed below are related conditions in which abnormal numbers of chromosomes are present. Select the exception.

Accepted Answer

Complete chromosome set refers to a normal set of chromosomes, whereas the other options are related to conditions involving abnormal numbers of chromosomes.

Question 9

White eyes in Drosophila is a mutation that turned out to be X-linked recessive. Would you expect that the white eye was discovered the first time in a male or female?

Accepted Answer

The answer of White eyes in Drosophila is a mutation...

Question 10

Color blindness is an X-linked recessive gene. Two normal-visioned parents produce a color-blind child. 
 (a) Is this child male or female? 
 (b) What are the genotypes of the parents? 
 (c) What are the chances that their next child will be a color-blind daughter?

Accepted Answer

The answer of Color blindness is an X-linked recessive gene....

Question 11

The pattern that would illustrate the inheritance of Huntington's is labeled by the letter ____.

Accepted Answer

The answer of  
 The pattern that would illustrate...

Question 12

There is an autosomal gene that controls baldness, and its expression is sex-influenced. The gene for baldness ( B ) is dominant in males but recessive in females. In females, the allele B ¹ for nonbaldness is dominant over the gene for baldness. If heterozygous, nonbald woman marries a nonbald man, what will be the appearance of their children? Work out the possibilities for each sex.

Accepted Answer

The answer of There is an autosomal gene that controls...

Question 13

Selecting the Exception Four of the five answers listed below are caused by recessive genes. Select the exception.

Accepted Answer

Huntington's disorder is caused by a dominant gene, while the other four are caused by recessive genes.

Question 14

If an X-linked recessive gene is expressed in 4 percent of the men, what proportion of women would express the recessive trait?

Accepted Answer

The answer of If an X-linked recessive gene is expressed...

Question 15

The pattern illustrating autosomal recessive inheritance is labeled by the letter ____.

Accepted Answer

The answer of  
 The pattern illustrating autosomal recessive...

Question 16

Red/green color blindness is an X-linked recessive trait. Two normal-visioned parents have a color-blind son. Indicate the genotype and phenotype of each parent and the son.

Accepted Answer

The answer of Red/green color blindness is an X-linked recessive...

Question 17

The pattern that would illustrate the inheritance of cystic fibrosis is labeled by the letter ____.

Accepted Answer

The answer of  
 The pattern that would illustrate...

Question 18

Hemophilia is an X-linked recessive gene. A normal woman whose father had hemophilia marries a normal man. What are the chances of hemophilia in their children?

Accepted Answer

The answer of Hemophilia is an X-linked recessive gene. A...

Question 19

Two Drosophila are crossed several times, with a total number of offspring of 106 females and 48 males. There is too great a deviation from the expected 1:1 ratio for chance alone to account for the difference. What other factor could account for this difference?

Accepted Answer

The answer of Two Drosophila are crossed several times, with...

Question 20

Selecting the Exception Four of the five answers listed below provide evidence that genes are located on chromosomes. Select the exception.

Accepted Answer

The answer of Selecting the Exception Four of the five...

Quiz 20: Chromosomes and Human Genetics

Classification. Answer the questions in reference to the five disorders listed below.

Classification. Answer the questions in reference to the five processes listed below. Note that to answer these questions you need to know that the sequence of amino acids directly reflects the sequence of genes that coded for their placement.

Classification. Answer the questions in reference to the five items listed below.