In this system, the sex of an individual is determined by a pair of sex chromosomes.Females typically have two of the same kind of sex chromosome (XX), and are called the homogametic sex. Y chromosomes carry the necessary genes for the development of male gonads, or testes. >> the Y chromosome produces testes-determining factor (TDF) which in turn causes the development of the testes. answered Mar 3, 2016 by Bridget . Testis-determining factor (TDF), also known as sex-determining region Y (SRY) protein, is a DNA-binding protein (also known as gene-regulatory protein/transcription factor) encoded by the SRY gene that is responsible for the initiation of male sex determination in therian mammals (placental mammals and marsupials).

Luteinizing hormone (LH) results in testosterone release. The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects (), some snakes, some fish (), and some plants (Ginkgo tree). There are two sex chromosomes (one pair) among them known as X and Y chromosome. Every man has X and Y chromosome and Y chromosome decides the male sex. Individuals that lack a Y chromosome (XO or XX) develop female gonads, or ovaries. The testes then secrete androgens that stimulate the formation of a … These organs produce estrogen and testosterone, which in turn signal either female or male tissue to develop. Interestingly, it took at least five copies of the X chromosome version of the Eif2s3y to produce these sad excuses for sperm, when only one copy of the Eif2s3y genes from Y chromosomes are needed to produce lots of healthy sperm. Recent genomic analyses in Drosophila, however, show that gene gain is prominent on young Y chromosomes.Meiosis- and RNAi-related genes often coamplify on recently formed X and Y chromosomes, are testis-expressed, and produce antisense transcripts and short RNAs. Gender is determined by the sex chromosomes. 0 votes.

asked Mar 3, 2016 in Psychology by Cessimer. Parents donate a set of chromosomes to their offspring, 23 pairs from each for a total of 46. • Chromosome pair 23 is radically different for males and females: females have two X chromosomes, whereas males have an X chromosome paired with a much smaller Y chromosome • The Y chromosome carries a male-determining gene, SRY, which causes testes to develop. During pregnancy, the presence of a Y chromosome leads the fetus to produce testes. Y chromosomes are typically viewed as genetic wastelands with few intact genes. The crucial gene on the Y chromosome that has this testis determining function is called Sry, for “sex-determining region of Y.” Remarkably, when this gene is introduced into the genome of an XX mouse zygote, the transgenic embryo produced develops as a male, even though it lacks all of the other genes on the Y chromosome (Figure 20-17). The SRY gene is required, however, and it is almost always located on the Y chromosome.

Testis-determining factor (TDF) or sex determining gene Y (SRY) located on the Y chromosome is one such gene. a. 2 c. 3 d. 4. general-psychology; 0 Answer. The X and Y chromosomes aid in the production of ovaries and testes, respectively. Best answer. The Y chromosome is not necessary for the male phenotype. Both functions of the testicle are influenced by gonadotropic hormones produced by the anterior pituitary. Key Difference – X vs Y Chromosomes The human genome has 46 chromosomes, arranged in 23 pairs. XX male syndrome, also known as De la Chapelle syndrome, is a rare congenital intersex condition where an individual with a 46 XX karyotype (otherwise associated with females) has phenotypically male characteristics that can vary among cases. These two chromosomes are designated as gender determination chromosomes. Key Difference – X vs Y Chromosomes The human genome has 46 chromosomes, arranged in 23 pairs. The primary functions of the testes are to produce sperm (spermatogenesis) and to produce androgens, primarily testosterone. In the mole-vole, X linkage of the testis-organizing H-Y gene is favored over its autosomal inheritance.


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