What is variation and its types?
Variation is the difference in characteristics among the individuals of the same species or among different genera or different species. The variation is of two types- a) Somatic variation. b)Germinal variation.
What is a example of genetic variation?
Genetic variation results in different forms, or alleles?, of genes. For example, if we look at eye colour, people with blue eyes have one allele of the gene for eye colour, whereas people with brown eyes will have a different allele of the gene.
What are types of variation?
Accordingly, the germinal variations are of two types, continuous and discontinuous.
- Continuous Variations: They are also called fluctuating variations because they fluctuate on either side (both plus and minus) of a mean or average for the species.
- Discontinuous Variations:
What do you mean by genetic variation?
Genetic variation refers to diversity in gene frequencies. Genetic variation can refer to differences between individuals or to differences between populations. Mutation is the ultimate source of genetic variation, but mechanisms such as sexual reproduction and genetic drift contribute to it as well.
Is genetic variation good or bad?
Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.
What are the causes of variation?
The two main causes of variation are mutation and genetic recombination in sexual reproduction.
What are the advantages of genetic variation?
it produces variation in the offspring. the species can adapt to new environments due to variation, which gives them a survival advantage. a disease or change in environment is less likely to affect all the individuals in a population.
What happens if there is no genetic variation?
Without genetic variation, a population cannot evolve in response to changing environmental variables and, as a result, may face an increased risk of extinction. But if they do not exist — if the right genetic variation is not present — the population will not evolve and could be wiped out by the disease.
What reduces genetic variation?
Sources of Decreased Variation Mutation, recombination, and gene flow all act to increase the amount of variation in the genotypes of a given population. There are also forces at work that act to decrease this variability.
Why is lack of genetic variation bad?
Small populations lose genetic variability because of genetic drift, and inbreeding within populations can further decrease individual variability. Lower variation depresses individual fitness, resistance to disease and parasites, and flexibility in coping with environmental chal- lenges.
What would happen if everyone was genetically identical?
No genetic variation among a breeding population would lead to an inbreeding depression (loss of heterozygosity) in the population. We would not be able to evolve and adapt to our environment, while also being genetically unvaried, leaving us open to the dangers of species wide disease, lethal homozygous Alleles, Etc.
Can two humans have the same DNA?
No two humans are genetically identical. Even monozygotic twins (who develop from one zygote) have infrequent genetic differences due to mutations occurring during development and gene copy-number variation. The differences between populations represent a small proportion of overall human genetic variation.
Can two persons have the same DNA?
It is a basic tenet of human biology, taught in grade schools everywhere: Identical twins come from the same fertilized egg and, thus, share identical genetic profiles. But according to new research, though identical twins share very similar genes, identical they are not.
Can 2 brothers have the same DNA?
Because of recombination, siblings only share about 50 percent of the same DNA, on average, Dennis says. So while biological siblings have the same family tree, their genetic code might be different in at least one of the areas looked at in a given test. That’s true even for fraternal twins.
Do Father and son have the same DNA?
The DNA in these new chromosomes provide the genetic information for the individual, the so-called genome. Each son receives DNA for his Y chromosome from his father. This DNA is not mixed with that of the mother, and it is identical to that of the father, unless a mutation occurs.
Will a donor egg have my DNA?
The resounding answer is yes. Because the baby’s DNA will only come from the egg donor and the sperm provider, many women using egg donation worry that they will not share any genetic information with their child.
Can two human eggs make a baby?
The bottom line is that you need both sperm and eggs to make an embryo. Just one of each will do, but pregnancy cannot happen without both in the mix. Side note: Even if two people cannot create a baby together, they can still share other things, like sexually transmitted infections (STIs).
Can a baby be made without sperm?
There are no good scientific or medical reasons to make human babies from artificial embryos made without sperm or eggs, says Nicolas Rivron at the Institute of Molecular Biotechnology in Vienna, Austria.
Will a donor egg look like me?
The Genetics of a Donor Egg That being said, it’s important for couples to understand that nothing is definitive — giving birth to a child naturally doesn’t ensure they look like you and using a donor egg doesn’t automatically mean your child won’t resemble you at all.
Can two females have a baby bone marrow?
Female sperm And women may be able to use the technique to produce sperm, allowing lesbian couples to have their own biological daughters. Nayernia says that researchers have produced the same early-stage sperm cells in mice from bone marrow cells taken from female mice.
Can men get pregnant?
Yes, it’s possible for men to become pregnant and give birth to children of their own.
Do bone marrow babies have defects?
This caused babies to be born with abnormal body parts, and significant birth defects are associated with its use. Lenalidomide is used in people with low-risk stages of MDS, and particularly in the 5q-MDS subtype, but it must be stopped if pregnancy is even being considered.
Has a bone marrow baby been born?
A baby girl, conceived in the hope that she can serve as a bone marrow donor for her teen-age sister, was born this week at Queen of the Valley Hospital in West Covina.