The Amami spiny rat (Tokudaia osimensis) lacks a Y chromosome, yet scientists at Hokkaido University in Japan have reported that key sex-determining genes continue to be expressed in this species. Provide possible explanations for why male differentiation can still occur in this mammalian species despite the absence of a Y chromosome.

Q: if cell division during gametogenesis is non-meiotic, what is the consequence to the future…

A: BASIC INFORMATION CELL DIVISION  It is necessary for all the cells In this the parent cell divides…

Q: Maleness and Male Fertility Are the OnlyKnown Y-Linked Traits in Humans Explain?

A: Humans have an XX-XY type of chromosomal determination of sex. Females possess two homomorphic or…

Q: What is the gene in the human chromosome that determines the "maleness"?

A: Gene is the sequence of nucleotides that encode a particular protein. The genes are present in the…

Q: Generally, sex chromosomes in male mammals are XY and females are XX. Following meiosis and gamete…

A: Meiosis is called the reduction division which divides the diploid germ cell into four haploid…

Q: Describe how nondisjunction in human female gametes can give rise to Klinefelter and Turner syndrome…

A: Gametes are formed by the process of meiosis.

Q: What sex ratio would you expect among the offspring of a cross between a normal mape mouse and a…

A: Sex ratio is defined as the ratio of males and females in the population. Generally in sexually…

Q: In humans, hemophilia is an X-linked recessive gene and will only be expressed in females if  they…

A: Hemophilia is a X linked recessive disorder so which is inherited in homozygous condition. In rare…

Q: What would be the outcome of a cross between a heterozygous female and a male that carries two…

A: The IGF2 (insulin-like growth factor 2) gene gives instructions for the synthesis of igf2…

Q: How do we know whether or not a heteromorphic chromosome such as the Y chromosome plays a crucial…

A: Sex determination is the foundation or establishment of sex through differential advancement in a…

Q: In chickens, a key gene involved in sex determination has recently been identified. Called DMRT1, it…

A: The Sex-determination system determines the development of characteristics of sexual aspects in…

Q: . Researchers discovered recently that the sole functionof the SRY protein is to activate an…

A: There are various genetic disorders that develop due to anomalies in sex chromosomes. They normally…

Q: What pathway is Fog2 gene product a part of and how does it affect sex determination?

A: Gata4 together with the cofactors Nr5a1 (Sf-1) and Fog 2 (Friend of Gata, 2; also known as Zfpm 2 )…

Q: Suppose you are analyzing the DNA from the polar bodies formed during human oogenesis. If the woman…

A: The process of the development of an oogonium into a mature ovum is termed oogenesis. It involves…

Q: In chickens, a key gene involved in sex determination has recently been identified. Called DMRT1, it…

A: SRY gene in humans is involved in the expression of a protein which is involved in male sexual…

Q: In certain salamanders, the sex of a genetic female can be altered, changing her into a functional…

A: Salamanders are vertebrates and they belong to class amphibia. Salamanders can survive on both lands…

Q: What specific observations (evidence) support the conclusions about sex determination in Drosophila…

A: BASIC INFORMATION SEX DETERMINATION  It is basically the establishment of the gender of an…

Q: Why is it that so many of the sex-linked traits we talk about in humans are carried on X chromosomes…

A: Traits can be dominant, recessive, sex linked recessive or sex linked dominant. Dominance is the…

Q: The inheritance in short wings in Drosophila fruit flies is an x-linked trait, recessive. Which…

A: X-linked recessive inheritance is caused when a mutation occurs in the X-chromosome therefore a male…

Q: The human RGS10 gene is found on Chromosome 10.  How many copies of RGS10 does one egg gamete have,…

A: The meiotic cell division is a process that takes place exclusively during the phenomenon of Sexual…

Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…

A: In Drosophila, sex determination is achieved by a balance of female determinants on the X chromosome…

Q: Outline the molecular mechanism of sex determination in Drosophila and mammals.

A: Sex determination refers to determining the sex of an individual. The sex of an organism is…

Q: What possible conclusions can be drawn from the observations that in male Drosophila, no crossing…

A: The structural components are also termed synaptonemal complexes. During the zygonema stage of…

Q: Do the data support the hypothesis that the timing of the endof cleavage depends on counting cell…

A: Cells are the basic structural and functional unit of the organism. Cell division is the process in…

Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…

A: Sex determination in Drosophila is achieved by the balance of female determinants on the X…

Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…

A: In Drosophila, sex determination is achieved by a balance of female determinants on the X chromosome…

Q: If you ignore the effect of crossing over, would you expect the genetic information in the two…

A: Spermatogenesis results in mature male gametes, also known as sperm but more precisely as…

Q: If each sperm of Species X has 10 chromosomes, what are the numbers of chromosomes and complements…

A: The sperms are male gametes that are produced through the process of spermatogenesis in the…

Q: In certain salamanders, the sex of a genetic female can be altered, changing her into a functional…

A: Salamander is an amphibious organism belongs to the order Urodela. Mostly they live in river streams…

Q: How do the chromosomal mechanisms determining sex differ in the three taxa males of bugs, humans,…

A: Mammals belong to the class Mammalia. They are vertebrates. It belongs to the kingdom Animalia and…

Q: Some individuals grow ear hair later in life, the gene for this trait is beleived to be carried on…

A: The phenotypic expression is the ultimate product of a gene. All of our phenotypic characteristics…

Q: A black female cat (XBXB) and an orange male cat (X0Y) weremated to each other and produced a male…

A: A calico cat is any breed of cat that has a tri-colored fur. It will mostly consist of a…

Q: How does sex determination in Drosophila differ from sex determination in humans?

A: Sex determination is a method for determining the sexual characteristics within an organism. These…

Q: Predict the phenotypes associated with the following mutant states. For each of the four conditions…

A: Gonadal determination of sexually indifferent gonads and genitalia involves a series of events…

Q: Genetic maternal effect is often seen in mammals. For example, research shows that the maternal…

A: In genetics, a maternal effect occurs when a mother's genotype is expressed in the phenotype of her…

Q: . A mouse sperm of genotype a B C D E fertilizes anegg of genotype a b c D e. What are all the…

A: Gene: Genes are genetic material that passes from parents to progeny. The dominant allele can…

Q: Name one trait each in humans & in drosophila whose genes are located on sex chromosome.

A: In both humans and Drosophila, the female possesses two homomorphic sex chromosomes i.e., XX and the…

Q: How do we know that Drosophila utilizes a different sexdetermination mechanism than mammals, even…

A: A chromosome is a compact form of DNA  molecule present in dividing cells. In metabolically active…

Q: XX individuals can be sex-reversed males if one of their X chromosomes contains a translocated…

A: In a normal female, there are two X chromosomes and their karyotype is (46, XX). However, in some…

Q: In humans, the AR gene is located on the X chromosome. If a person who is XY has a complete deletion…

A: Androgen is a steroid hormone secreted in males that bind with the androgen receptors located on…

Q: Give the typical sex-chromosome complement found in the cells of people with Turner syndrome, with…

A: Chromosome complement refers to the entire set of chromosomes in the nucleus of a cell in a…

Q: What is the difference between sex determination in mammals and in Drosophila?

A: Sex determination is the process of identification of different sex that is male and female, in…

Q: Describe the major difference between sex determination in Drosophila and in humans.

A: Drosophila melanogaster refers to the fruit fly which is widely used in genetic research as it has…

Q: The Oregon creeping vole, Microtus oregoni, has a very unusual meiosis?. In this rodent, males are…

A: In the creeping vole, Microtus oregoni, females are X0 and males are XY. In the female germ line,…