BIO 222 Chap 4: Sex Determination in Drosophila and Humans

Which of the following is a key difference between chromosomal and genic sex determination systems?

In Drosophila melanogaster, sex is determined by the X:A ratio. What does 'A' represent in this ratio?

According to the provided information on Drosophila, what sexual phenotype would an individual with an X:A ratio of 1.5 likely exhibit?

What is the role of the SRY gene in human sex determination?

Which of the following genotypes in humans results in Turner syndrome?

What is a common characteristic of individuals with Klinefelter syndrome?

Based on the principles of sex chromosome function, what phenotype would you expect in an individual with an XXYY chromosome complement in humans?

What is the most accurate interpretation of the statement: 'The absence of Y results in a female phenotype'?

In a species with an XX-XY sex-determination system, how do the gametes produced by the heterogametic sex differ from those produced by the homogametic sex?

Which statement best describes the genic sex-determination system?

In environmental sex determination, what primarily influences the sex of an offspring?

A species of fish relies on a genic sex-determination system. What would you expect to find regarding sex chromosomes in this species?

How does the ZZ-ZW sex-determination system differ from the XX-XY system?

In a turtle species with environmental sex determination, warmer incubation temperatures produce females. If a nest of eggs is consistently incubated at cooler temperatures, what would be the likely outcome?

Consider a newly discovered insect species where sex determination is suspected to be genic. Which observation would best support this hypothesis?

A researcher is studying a population of grasshoppers with an XX-XO sex-determination system. What chromosomal composition would you expect to find in the male grasshoppers?

What is the direct function of the SRY gene in humans?

A person with Androgen-insensitivity syndrome is genotypically male (XY). Which of the following best describes why they develop a female phenotype?

Someone with Klinefelter syndrome has a XXXY genotype. Which of the following statements is most accurate regarding this condition?

In Drosophila, white eyes is an X-linked recessive trait. If a white-eyed female is crossed with a wild-type red-eyed male, what proportion of the male offspring will have white eyes?

In an experiment involving eye color in Drosophila, Bridges crossed a white-eyed female with a red-eyed male and observed a small number of red-eyed males in the F1 generation. What was the genotype of these exceptional red-eyed males?

A woman with hemophilia, an X-linked recessive trait, has children with a man who does not have hemophilia. What is the probability that their daughters will be carriers of hemophilia?

Considering the general trend of Y chromosome evolution, what is the most likely outcome for Y-linked genes over a long evolutionary timescale?

What is the significance of palindromic sequences found on the Y chromosome?

Which of the following statements correctly describes the relationship between ploidy and sex determination in a haplodiploidy system?

In species with XX-XY sex determination, what would be the result of a mutation that causes the SRY gene on the Y chromosome to be non-functional?

A researcher discovers a new insect species. Females are ZZ and males are ZW. Is this statement correct?

Which of the following statements accurately compares the XX-XO and XX-XY sex-determination systems?

In a dioecious plant species with an XX-XY sex-determination system, a mutation arises that prevents meiosis during pollen formation. What would be the resulting pollen grain's chromosomal content?

How does sexual reproduction contribute to genetic diversity, and why is this diversity important for the long-term survival of a species?

A species of fish is discovered to be hermaphroditic. Which of the following is a valid conclusion based on this information?

In bees, haplodiploidy determines sex. Queen bees are diploid and lay both fertilized and unfertilized eggs. What will be the sex of the offspring from each type of egg?