Podcast
Questions and Answers
What is the characteristic of the X and Y chromosomes during meiosis in male mammals?
What is the characteristic of the X and Y chromosomes during meiosis in male mammals?
- They are identical and behave like autosomes.
- They are fully homologous and undergo crossing-over freely.
- They are partially homologous and crossing-over is restricted to pseudoautosomal regions. (correct)
- They are completely non-homologous and do not pair during meiosis.
What is the sex determination system in birds and some reptiles?
What is the sex determination system in birds and some reptiles?
- XY system, where males are XX and females are XY.
- XX system, where males are XY and females are XX.
- YW system, where males are YY and females are YW.
- ZW system, where males are ZZ and females are ZW. (correct)
In mammals, what is the percentage of male gametes that contain an X chromosome?
In mammals, what is the percentage of male gametes that contain an X chromosome?
- 100%
- 50% (correct)
- 25%
- 75%
What is the behavior of the two X chromosomes in female mammals during meiosis?
What is the behavior of the two X chromosomes in female mammals during meiosis?
What is the term for the regions of the X and Y chromosomes where crossing-over occurs during prophase I of meiosis?
What is the term for the regions of the X and Y chromosomes where crossing-over occurs during prophase I of meiosis?
What is the primary function of the testis-determining factor TDF protein?
What is the primary function of the testis-determining factor TDF protein?
Which of the following statements about the X and Y chromosomes in mammals is TRUE?
Which of the following statements about the X and Y chromosomes in mammals is TRUE?
During meiosis in the ovaries, what is the resulting number of sex chromosomes in each gamete?
During meiosis in the ovaries, what is the resulting number of sex chromosomes in each gamete?
In mammals, which of the following is responsible for determining the sex of an individual?
In mammals, which of the following is responsible for determining the sex of an individual?
What is the approximate length of the human X chromosome?
What is the approximate length of the human X chromosome?
What is the primary function of the SRY gene in mammals?
What is the primary function of the SRY gene in mammals?
What is the outcome of crossing-over between X and Y chromosomes in humans?
What is the outcome of crossing-over between X and Y chromosomes in humans?
What is the significance of the pseudoautosomal regions (PARs) in sex determination?
What is the significance of the pseudoautosomal regions (PARs) in sex determination?
What is the chromosomal composition of a zygote formed from a 44+ XY sperm and a 44+ XX ovum?
What is the chromosomal composition of a zygote formed from a 44+ XY sperm and a 44+ XX ovum?
What is the result of introducing an SRY transgene into a chromosomally female mouse?
What is the result of introducing an SRY transgene into a chromosomally female mouse?
What is the genotype of a male who expresses an X-linked recessive trait?
What is the genotype of a male who expresses an X-linked recessive trait?
A female is a carrier of an X-linked recessive trait. What is the probability that her sons will express the trait?
A female is a carrier of an X-linked recessive trait. What is the probability that her sons will express the trait?
A male has an X-linked dominant trait. What is the probability that his daughters will inherit the trait?
A male has an X-linked dominant trait. What is the probability that his daughters will inherit the trait?
What is the genotype of a female who expresses an X-linked recessive trait?
What is the genotype of a female who expresses an X-linked recessive trait?
A female is homozygous for an X-linked dominant allele. What is the probability that her sons will inherit the dominant allele?
A female is homozygous for an X-linked dominant allele. What is the probability that her sons will inherit the dominant allele?
What is the significance of sister chromatids forming chiasmata in the same homologous chromosome?
What is the significance of sister chromatids forming chiasmata in the same homologous chromosome?
What is the purpose of determining the recombination rate in Drosophila melanogaster crosses?
What is the purpose of determining the recombination rate in Drosophila melanogaster crosses?
What is the symbol 'b' representing in the given cross?
What is the symbol 'b' representing in the given cross?
What is the genetic consequence of recombination between linked genes?
What is the genetic consequence of recombination between linked genes?
What is the relative position of the three genes on the chromosome?
What is the relative position of the three genes on the chromosome?
What is the fundamental concept underlying the chromosomal basis of inheritance?
What is the fundamental concept underlying the chromosomal basis of inheritance?
Who is credited with providing the first solid evidence that genes are located on specific chromosomes?
Who is credited with providing the first solid evidence that genes are located on specific chromosomes?
What is the relationship between genes and alleles?
What is the relationship between genes and alleles?
What is the significance of homologous chromosomes in the context of gene inheritance?
What is the significance of homologous chromosomes in the context of gene inheritance?
What is the primary conclusion that can be drawn from the chromosomal basis of Mendel's laws?
What is the primary conclusion that can be drawn from the chromosomal basis of Mendel's laws?
What was the species of fruit fly used by Morgan in his experiments?
What was the species of fruit fly used by Morgan in his experiments?
What is the sex chromosome constitution of a male fruit fly?
What is the sex chromosome constitution of a male fruit fly?
What is the total number of chromosomes in a fruit fly cell?
What is the total number of chromosomes in a fruit fly cell?
Why are fruit flies used as an ideal experimental organism for genetics?
Why are fruit flies used as an ideal experimental organism for genetics?
What was the title of Morgan's 1915 publication?
What was the title of Morgan's 1915 publication?
What was the significance of Morgan's experiments with Drosophila melanogaster?
What was the significance of Morgan's experiments with Drosophila melanogaster?
In what year was Morgan awarded the Nobel Prize in Physiology or Medicine?
In what year was Morgan awarded the Nobel Prize in Physiology or Medicine?
What is the number of autosome pairs in a fruit fly?
What is the number of autosome pairs in a fruit fly?
What is the sex chromosome constitution of a female fruit fly?
What is the sex chromosome constitution of a female fruit fly?
How often can a new generation of fruit flies be bred?
How often can a new generation of fruit flies be bred?
