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Sometimes, however, two eggs or ova are released and fertilized by two separate sperm. The result is dizygotic or fraternal twins. These two individuals share the same amount of genetic material as would any two children from the same mother and father. In other words, they possess a different genotype and phenotype.
- Why do twins not have the same phenotype?
- Why do fraternal twins have different genes?
- Do twins have different phenotypes?
- Why can siblings have different phenotypes?
- Do fraternal twins have the same phenotype?
- Can fraternal twins have the same genotype?
- What means phenotype?
- Do twins have the exact same DNA?
- What makes identical twins different?
- What is the reason for the phenotypic differences at the molecular level?
- Why do monozygotic twins have different phenotypes psychology?
- What factors affect phenotype?
- How can two organisms have the same phenotype but different genotypes?
- Why do siblings look different even though they have the same parents?
- How do different genes lead to different phenotypes?
Why do twins not have the same phenotype?
Identical or monozygotic twins occur when a single egg is fertilised to form 1 zygote that divides into 2 separate embryos. As a result, identical twins share identical DNA but may show differences in their phenotype due to environmental factors.
Why do fraternal twins have different genes?
Fraternal twins are really just siblings who share the same womb. Each starts out as a separate egg fertilized by a separate sperm. They don't share any more DNA than do any two siblings. Siblings normally have 50% of their DNA the same.
Do twins have different phenotypes?
Even two organisms with identical genotypes normally differ in their phenotypes. ... Identical twins share the same genotype, since their genomes are identical; but they never have the same phenotype, although their phenotypes may be very similar.
Why can siblings have different phenotypes?
At first it might seem like kids from the same parents should look alike. ... But brothers and sisters don't look exactly alike because everyone (including parents) actually has two copies of most of their genes. And these copies can be different. Parents pass one of their two copies of each of their genes to their kids.
Do fraternal twins have the same phenotype?
The result is the creation of two separate, but genetically identical offspring. That is, they possess the same genotype and often the same phenotype. ... The result is dizygotic or fraternal twins. These two individuals share the same amount of genetic material as would any two children from the same mother and father.
Can fraternal twins have the same genotype?
Characteristics of Fraternal Twins
Monozygotic twins share the same genetic makeup, or genotype (although their DNA is not necessarily identical.) ... Unlike monozygotic twins, fraternal twins may look nothing alike, including having different: Eye color.
What means phenotype?
A phenotype is an individual's observable traits, such as height, eye color, and blood type. The genetic contribution to the phenotype is called the genotype. Some traits are largely determined by the genotype, while other traits are largely determined by environmental factors.
Do twins have the exact same DNA?
It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. ... While the two babies share the same DNA code, there is more to our genetics than just that.
What makes identical twins different?
Identical Twins
They result from the fertilization of a single egg that splits in two. Identical twins share all of their genes and are always of the same sex. In contrast, fraternal, or dizygotic, twins result from the fertilization of two separate eggs during the same pregnancy.
What is the reason for the phenotypic differences at the molecular level?
These differences have usually been attributed to the effects of environment (the 'non-shared environment' in the case of MZ twins) (9), as a default explanation for variation that remains after genetic effects are accounted for.
Why do monozygotic twins have different phenotypes psychology?
b. Behaviour reflects an interaction between genetics and the environment. Why do monozygotic twins have different phenotypes? ... They have only minor phenotypic variation across a few physical traits but no differences in psychological traits.
What factors affect phenotype?
An organism's phenotype results from two basic factors: the expression of an organism's genetic code, or its genotype, and the influence of environmental factors. Both factors may interact, further affecting phenotype.
How can two organisms have the same phenotype but different genotypes?
Same phenotype but different genotype is possible due to presence of dominant allele. ... A person can have a dominant allele on both the homologous chromosomes (i.e. in double dose) while another person may have single dominant allele and a corresponding recessive allele.
Why do siblings look different even though they have the same parents?
Hence the child gets new chromosomes, the genes in which contain a mix of both their father's and mother's genes. ... This is the reason that siblings from the same parents can sometimes look so dissimilar, because the set of genes in one person can be immensely different from the other, despite having the same parents.
How do different genes lead to different phenotypes?
Dominance relationships between alleles for a given trait can impact phenotypic ratios, but interactions between different genes can also impact phenotype. Such traits that result from the interaction among multiple genes and their environment are called complex traits.
