Is an environmental variable that affects wing color in Western white butterflies?
Which of the following is an example of a polygenic trait?
Because multiple genes are involved, polygenic traits do not follow Mendel’s pattern of inheritance. Instead of being measured discretely, they are often represented as a range of continuous variation. Some examples of polygenic traits are height, skin color, eye color, and hair color.
Are different forms of a gene?
Different forms of same gene are called alleles.
Can one gene have more than one wild type allele?
Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist at the population level such that many combinations of two alleles are observed. The variant may be recessive or dominant to the wild-type allele.
Why do we have 2 alleles for each gene?
Since diploid organisms have two copies of each chromosome, they have two of each gene. Since genes come in more than one version, an organism can have two of the same alleles of a gene, or two different alleles. This is important because alleles can be dominant, recessive, or codominant to each other.
What would be the best way to distinguish between two alleles and two genes?
What would be the best way to distinguish between two alleles and two genes? Examine their DNA; the DNA sequences of two different alleles would be more similar than the sequences of two different genes.
What group has the most genetic variation?
This is because most variation is within, rather than between, races. On average, any local population contains 85% of all human genetic variation, and any continent contains 94%….
- Italians and Ethiopians.
- Senegalese and Kenyans.
- Italians and Swedes.
- Chinese and Lakota (Sioux)
- Saudi Arabians and Ethiopians.
Can a child have 2 biological fathers?
It is possible for twins to have different fathers in a phenomenon called heteropaternal superfecundation, which occurs when two of a woman’s eggs are fertilized by sperm from two different men. Ordinarily, a woman becomes pregnant because one of her eggs has been fertilized by sperm
Can 2 sperm fertilize the same egg?
Occasionally, two sperm are known to fertilize a single egg; this ‘double fertilization’ is thought to happen in about 1% of human conceptions. An embryo created this way doesn’t usually survive, but a few cases are known to have made it — these children are chimaeras of cells with X and Y chromosomes
What happens if more than one sperm enters the egg?
If more than one sperm fuses—a condition called polyspermy—multipolar or extra mitotic spindles are formed, resulting in faulty segregation of chromosomes during cell division; nondiploid cells are produced, and development usually stops. Two mechanisms can operate to ensure that only one sperm fertilizes the egg.
Do you feel anything when sperm meets egg?
In the uterus, the morula becomes a blastocyst and eventually burrows into the uterine lining in a process called implantation. Although some women report feeling cramping or pain during the implantation process, not everyone will experience this symptom
Can a woman get pregnant by two different guys at the same time?
Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it’s possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs. This is what happened to the woman in New Jersey
Can you have a baby 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.
What happens to sperm if a woman is already pregnant?
Most of it will simply be discharged from the body through the vaginal opening. Thanks to the placenta, amniotic sac, and mucus plug covering the cervix, your baby has a protection system that’s very specific about what goes in and stays out!2020年8月25日