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  2. Diabetic embryopathy - Wikipedia

    en.wikipedia.org/wiki/Diabetic_embryopathy

    In maternal diabetes, 90% of pregnancy losses happen in the first trimester due to oxidative stress. Diabetic embryopathy abortions in the second-trimester are most likely due to severe birth defect , maternal metabolic derangement, placental insufficiency and fetal hypoxia due to membrane rupture.

  3. Gene duplication - Wikipedia

    en.wikipedia.org/wiki/Gene_duplication

    Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution.It can be defined as any duplication of a region of DNA that contains a gene.

  4. Maternal effect - Wikipedia

    en.wikipedia.org/wiki/Maternal_effect

    In genetics, a maternal effect occurs when the phenotype of an organism is determined by the genotype of its mother. [1] For example, if a mutation is maternal effect recessive, then a female homozygous for the mutation may appear phenotypically normal, however her offspring will show the mutant phenotype, even if they are heterozygous for the mutation.

  5. Gene redundancy - Wikipedia

    en.wikipedia.org/wiki/Gene_redundancy

    During nonfunctionalization, or degeneration/gene loss, one copy of the duplicated gene acquires mutations that render it inactive or silent. Non-functionalization is often the result of single gene duplications. [11] At this time, the gene has no function and is called a pseudogene. Pseudogenes can be lost over time due to genetic mutations.

  6. Chromosomal rearrangement - Wikipedia

    en.wikipedia.org/wiki/Chromosomal_rearrangement

    It shows 22 homologous autosomal chromosome pairs, both the female (XX) and male (XY) versions of the two sex chromosomes, as well as the mitochondrial genome (at bottom left). In genetics , a chromosomal rearrangement is a mutation that is a type of chromosome abnormality involving a change in the structure of the native chromosome . [ 1 ]

  7. Congenital adrenal hyperplasia due to 21-hydroxylase deficiency

    en.wikipedia.org/wiki/Congenital_adrenal...

    CAH can occur in various forms. The clinical presentation of each form is different and depends to a large extent on the kind of the underlying 21-hydroxylase enzyme defect. [9] Classical forms appear in infancy, and nonclassical forms appear in late childhood. The presentation in patients with classical CAH can be further subdivided into two ...

  8. Gonadal dysgenesis - Wikipedia

    en.wikipedia.org/wiki/Gonadal_dysgenesis

    The absence of the steroid hormones commonly associated with males drives Müllerian duct development and promotes the development of female genitalia, if anti-Müllerian hormone is suppressed or the body is insensitive, persistent Müllerian duct syndrome occurs when the individual has partial female reproductive, and partial male reproductive ...

  9. XY gonadal dysgenesis - Wikipedia

    en.wikipedia.org/wiki/XY_gonadal_dysgenesis

    XY complete gonadal dysgenesis, also known as Swyer syndrome, is a type of defect hypogonadism in a person whose karyotype is 46,XY. Though they typically have normal vulvas, [1] the person has underdeveloped gonads, fibrous tissue termed "streak gonads", and if left untreated, will not experience puberty.