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Trisomy 21 (Down syndrome) is the most common type of chromosomal abnormality that is viable in humans. Individuals with Down syndrome have an extra copy of chromosome 21, which can result in distinctive physical characteristics and developmental delays, but many individuals with Down syndrome lead healthy and fulfilling lives.
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What evolutionary barrier causes an infertile offspring?
An evolutionary barrier that could cause an infertile offspring is genetic incompatibility between the parents, leading to mismatched or non-viable offspring. This can occur when different species attempt to reproduce, resulting in a hybrid that is infertile. Additionally, mutations or chromosomal abnormalities can also lead to infertility in offspring.
What is non viable embryo?
A non-viable embryo is an embryo that is unable to survive and develop into a fetus. This can be due to genetic abnormalities, poor quality of the embryo, or other factors that prevent successful implantation or development in the uterus.
Is it possible for you to have fertilization but no implantation of the fertilized egg?
It is possible for a fertilized egg not implant in the uterine lining, it could be due to stress, certain drugs or medications, or that the egg was not viable. This situation is very common, possibly happening to a third of fertilized eggs.
What is polyspermy in humans?
Polyspermy is when more than one sperm penetrate one egg during conception. Normally, there are blocks to polyspermy because humans are generally monospermic - only one sperm and one egg can create a viable zygote. Thus, there are biological blocks to polyspermy in humans.
Why are karyotypes useful?
Karyotypes are chromosome maps evaluated for gross genetic defects such as extra or missing chromosomes or large translocations between chromosomes. Many of these gross genetic defects are non-viable, meaning the fetus will not survive to the point of birth, but a few can be viable (think trisomy 21 [Down's syndrome] and fragile X syndrome). With this information, parents can either prepare themselves mentally and emotionally for the potential life-long complications or can choose to terminate the pregnancy.
What type of chromosomal abnormality is most likely to be viable in humans?
Trisomy
What evolutionary barrier causes an infertile offspring?
An evolutionary barrier that could cause an infertile offspring is genetic incompatibility between the parents, leading to mismatched or non-viable offspring. This can occur when different species attempt to reproduce, resulting in a hybrid that is infertile. Additionally, mutations or chromosomal abnormalities can also lead to infertility in offspring.
Is a triploid chromosome viable in humans?
Triploid chromosome (69 total chromosomes instead of 46) is not viable in humans and typically results in miscarriage. It is considered a lethal condition due to the abnormal number of chromosomes, which disrupts normal genetic function and development.
What is non viable embryo?
A non-viable embryo is an embryo that is unable to survive and develop into a fetus. This can be due to genetic abnormalities, poor quality of the embryo, or other factors that prevent successful implantation or development in the uterus.
Is it possible for you to have fertilization but no implantation of the fertilized egg?
It is possible for a fertilized egg not implant in the uterine lining, it could be due to stress, certain drugs or medications, or that the egg was not viable. This situation is very common, possibly happening to a third of fertilized eggs.
What is polyspermy in humans?
Polyspermy is when more than one sperm penetrate one egg during conception. Normally, there are blocks to polyspermy because humans are generally monospermic - only one sperm and one egg can create a viable zygote. Thus, there are biological blocks to polyspermy in humans.
What are Chromosomal Genetic Disorders?
Genetic anomalies where the normal compliment of chromosomes is either more or less than the expected value. In humans the most common trisomy occurs with chromosome 21 and results in Down Syndrome. Very few instances of fewer than a 2N chromosome count result in viable offspring although a child with a single X (sex chromosome) can reach term.
Why do you think in humans there are no viable trisomies of chromosome 1?
they are lethal and cause spontaneous abortion of the embryo early in development.
How could neanderthal and human interbreed to produce healthy viable offspring?
Neanderthals and humans were genetically similar enough to be able to produce viable offspring when interbreeding occurred. The hybrid offspring likely benefited from gene flow between the two populations, leading to increased genetic diversity. Additionally, the ability to interbreed indicates that Neanderthals and humans were closely related species.
How could Neanderthals and Humans interbreed to produce fertile and viable offspring Assuming they were different species?
Neanderthals and humans are genetically similar. Less than one percent difference in their DNA.
What happens to the zygote that is monosomic?
A monosomic zygote has one less chromosome than normal. This can result in genetic disorders or developmental abnormalities. Most monosomic zygotes are not viable and typically result in miscarriage.
What will happen if a plant DNA was mixed on human DNA?
Mixing plant DNA with human DNA is not possible through natural means. Even if it were possible, the outcome would likely be non-viable or result in severe genetic abnormalities due to the vast differences in genetic makeup and biological processes between plants and animals.
