The Sex Chromosome ( X And Y ) Originates From A Pair Of Autosomes Essay

5. Males transmit their Y chromosome to their sons. This means that sons will not inherit an X-linked recessive condition from their father.

For this assignment, I will use the websites, lab and materials from this week and complete an internet search of my own on chromosomes. I will write a two- page essay that explains how conditions caused by extra or missing chromosomes reflect a meiotic error. I will also choose two conditions or diseases to review. Also, distinguish among the modes of inheritance.

If it weren't for _____, chromosome number would double with every generation of sexual reproduction.

Originally, researchers and scientists thought a duplication in the Y chromosome was the connection between how genetics influence crime. The male karyotype would be XYY instead of XY. They have a tendency for hyper-aggressiveness and violence (Wachbroit). This unique karyotype also leads to a significant number of abortions if the fetus carries the karyotype. The other effects of this mutation are men that are taller, less intelligent, hyperactive, and are more impulsive (Wachbroit). After much research no one could relate this to how it

gametes during meiosis in the F generation. The F can be thought of as having been formed

Biological sex is determined by chromosomes in your genes. At prenatal development, only a few weeks after conception, there is no notable difference between male and female structure until the Gonadal Ridges, the structure which develops either female or male sex organs, grows to determine the sex of the baby. All prenatal babies have genitalia that appears distinctly feminine until at three months, hormones- testosterone if the baby’s to be a boy, and oestrogen if the baby’s to be a girl- is released and the baby develops into the hormone determined gender. For these reasons it is believed that there is a direct link between chromosomes and sex, and therefore sex and

The patient whose chromosomes are organized on the Karyotype Worksheet #1, is a normal female as indicated by her XX sex chromosomes, with a total number of 46 chromosomes and her karyotype doesn’t exhibit any aneuploidy or structural errors.

Y-linked genes typically determine sexual orientation, whereas X-linked genes typically determine an abundance of other traits because it’s much bigger than the Y-chromosome. Males are hemizygous because they lack a second copy of an X chromosome (XY), unlike women who have 2 (XX). This is why its much more common for a man to inherit an X-linked recessive disorder because they don’t have a second X chromosome to compensate. However, women can still express these traits and also be carriers if they are homozygous for the allele. A Barr body forms from the inactive X that

Normally males have 46 chromosomes which include one X and one Y chromosomes, but males with XYY Syndrome have 47 chromosomes, two of which are Y chromosomes. Most cases of XYY Syndrome occur before conception due to a cell division error in the sperm. Rarely does the cell division error happen after conception.

A con for sexual reproduction is during meiosis. An egg and sperm cell usually have 23 chromosomes each. When an egg gets fertilized by a sperm cell it combines to 46 chromosomes. Human beings have 46 chromosomes each. When something goes wrong and a baby inside a womb gets one more extra chromosome, they get Down syndrome.

Another biological theory bases its facts on the chromosomes that determine a person’s sex, XX in women and XY in men. Some theorists have speculated that men who have XYY chromosomes might be more aggressive and are therefore more likely to commit more crime because of the extra Y. It has been established that XYY men face a noticeably increased risk of developmental delay

The chromosomal abnormality that appears in the karyotype in Figure four is an extra chromosome 23, which happens to be an X chromosome. This abnormality originated from the mother because nondisjunction

the definition of sex-linked genes, and examples of sex-linked genes in humans and other organisms

The XXY syndrome, most commonly known as Klinefelter syndrome (KS), only affects males of all ages. This syndrome occurs when there is a random genetic error after conception and is not curable, however treatment can help.All females have XX chromosome and all males have XY chromosomes. Unlike the normal XY type that all males have, males affected have an additional X chromosome which results into many symptoms such as impaired spermatogenesis, low testosterone, and male hypogonadism. Since Klinefelter syndrome is related to the sex chromosomes of males, it is a sex link trait.

This table helps show all the possible genotypes from one set of parents. The table shows that the genotypes purple and starchy are dominant, and the genotypes yellow and sweet are recessive.(stallsmith)