Quiz 5 (Exam 2)

Question 1

True or false: All the genes that serve as the underlying basis of sex determination are located on only sex chromosomes.

Answer 1

False

Question 2

Which of the following are heterogametic?
There may be more than one answer.

All butterfly females
Human female
Chicken males
Cat females
Dog males
Chicken females
Certain butterfly females
Human males

Answer 2

Dog males
Chicken females
Certain butterfly females
Human males

Question 3

Which of the following are associated with 47,XXY?
There may be more than one answer.

Individuals are generally tall and often have long arms and legs.
Klinefelter syndrome
Have more than one Y chromosome
Turner syndrome
Have more than one X chromosome
Individuals have short stature.

Answer 3

Individuals are generally tall and often have long arms and legs.
Klinefelter syndrome
Have more than one X chromosome

Question 4

Which one of the following statements are TRUE relating to sexual differentiation in Humans?
There may be more than one answer.

• Development of the medulla into a ovarian tissues is initiated around the 12th week of fetal development if the cells of the gonadal ridges have an absence of a Y chromosome..
• Development of the cortex into a testis is initiated around the 12th week of fetal development if the cells of the gonadal ridges have an XY constitution.
• By the twenty-fifth week of fetal development, all oocytes become arrested in meiosis and remain dormant until puberty is reached.
• Development of the medulla into a testis is initiated around the 7th week of fetal development if the cells of the gonadal ridges have an XY constitution.
• Primary spermatocytes are produced 7th week of fetal development in the presence of a Y chromosome.

Answer 4

• By the twenty-fifth week of fetal development, all oocytes become arrested in meiosis and remain dormant until puberty is reached.
• Development of the medulla into a testis is initiated around the 7th week of fetal development if the cells of the gonadal ridges have an XY constitution.

Question 5

The testis-determining factor (TDF) is ______________________________________.
There may be more than one answer.

• None of these statements are true.
• Present in only Humans.
• Encoded by genes located in the heterochromatin region of the Y chromosome.
• A protein that causes the undifferentiated gonadal tissue of the embryo to form testes.
• Encoded by the SRY gene.

Answer 5

• A protein that causes the undifferentiated gonadal tissue of the embryo to form testes.
  Correct!
• Encoded by the SRY gene.

Question 6

The sexual phenotypes in Caenorhabditis elegans include:
There may be more than one answer.

• Hermaphrodites
• Females
• Meta females
• Males
• Meta males

Answer 6

• Hermaphrodites
• Males

Question 7

Which of the following may be involve with sex determination in mammals, vertebrate or invertebrates?
There may be more than one answer.

• Temperature
• Diet
• Ratio of Y Chromosomes to sets of autosomes
• Sound
• Light
• Placing a hammer/scissor under the bed during conception.
• Ratio of X Chromosomes to sets of autosomes
• Vibration

Answer 7

• Temperature
• Ratio of X Chromosomes to sets of autosomes

Question 8

In Drosophila, the X chromosome may become attached to one another (XX) such that they always segregate together. Some flies thus contain a set of attached X chromosomes plus a Y chromosome. What sex would such a fly be?

• Hermaphrodite
• Shemale
• Male
• Female

Answer 8

• Female

Question 9

A __________________________ is a group of genes or DNA sequences that are inherited together on the same chromosome.

• Haplotype
• Phenotype
• Genotype
• Heteroplast

Answer 9

• Haplotype