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What is the event that results when the maternal and paternal chromosomes combine?
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∙ 10y ago
Fertilization
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∙ 10y ago
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How can a genetic disorders as Turner syndrome occur?
Going down to the cellular level, it occurs in meiosis when chromosomes fail to separate (nondisjuction). We get a set of chromosomes from our paternal side and the other set from out maternal side. For example, one of the gamete that may have came from our maternal side contains no chromosomes , O, when it should contain that chromosome x while from our paternal side we get a gamete containing the x chromosomes. This results in a XO, a sterile female when the normal sex chromosomes are XX or XY. -or- nondisjunction
What is swapping of genetic material between homologous chromosomes?
Swapping of genetic genetic material is when two chromosomes (maternal and paternal) with the same gene sequence exchange genes, this occurs during Phrophase 1 of meiosis by a process called crossing over. Hope this helps.
Where can you find information about someone who has both Down syndrome as well as Klinefelter's syndrome?
Causes of Klinefelter SyndromeThe additional sex chromosomes in men with Klinefelter syndrome results from nondisjunction during meiosis and may have a paternal (50 to 60 percent) or maternal (40 to 50 percent) origin. This contrasts with Down syndrome, which is caused predominantly by maternal nondisjunction and inheritance of the extra chromosome 21 from the mother.
Is angel-man syndrome sex-linked?
No. However, if the maternal copy of chromosome 15 has a mutation on a specific gene, angelman's results. Also, getting two copies of chromosome 15 from the father results in angelman's (Paternal uniparental disomy).
Independent assortment in sexual reproduction?
Independent assortment happens at random when alleles are taken from different homlogous chromosomes or when the same pair of chroosomes are far apart during meiosis; this results in diversity in genetic combinations.
When K and I- combine a(n) bond results.?
When K+ and I- combine, a(n) _________ bond results.
What will be the gender if X and Y combine?
In the genetic system. XX is the female and XY is the male. There are four ways this can combine X"X' & XY as X"X Female X'X Female X"Y Male X'Y Male The are dashes on the 'X's' for clarity of combination. This results in an equal number of females and males being born.
When K plus and I- combine a(n) bond results.?
When K+ and I- combine, a(n) _________ bond results.
What is genetic combination?
in meiosis, prophase 1( the longest stage ) there is a particular stage called PACHYTENE where there is crossing of the chromatids ( the arms of the chromosome) belonging to one paternal and one maternal. there is subsequent breakage and rejoining of the chromatids which results in variation called as genetic recombination.
Why does turner's syndrome occur?
Going down to the cellular level, it occurs in meiosis when chromosomes fail to separate (nondisjuction). We get a set of chromosomes from our paternal side and the other set from out maternal side. For example, one of the gamete that may have came from our maternal side contains no chromosomes , O, when it should contain that chromosome x while from our paternal side we get a gamete containing the x chromosomes. This results in a XO, a sterile female when the normal sex chromosomes are XX or XY. -or- nondisjunction
What occurs during prophase 1 of meiosis?
In Prophase I: - The duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. - DNA is exchanged between homologous (similar) chromosomes in a process called 'homologous recombination'. - This often results in the non-sister chromatids crossing over*. The new combinations of DNA created during crossover are a significant source of genetic variation. *at points called chiasmata (plural; singular chiasma).
When do homologues pair?
A homologous pair is a pair of chromosomes that exist in diploid cells. One of the pair you inherit from your father, the other from your mother. A human has 22 pairs of homologous chromosomes (these do not include sex chromosomes). They are the same length and shape. They also share the same genes. The sequences of the genes may be different, which is what results in genetic variation, but the genes are the same.
