Could be ee; attached earlobes. The expression of one’s genotype, such as EE, Ee or ee, is called one’s phenotype. … In the example above about earlobes, both the EE and ee individuals are homozygous for the trait. The person with the Ee genotype is heterozygous for the trait, in this case, free earlobes.
Are attached earlobes dominant or recessive?
If they attach directly to the side of the head, they are attached earlobes. Some scientists have reported that this trait is due to a single gene for which unattached earlobes is dominant and attached earlobes is recessive. Other scientists have reported that this trait is probably due to several genes.
How many possible genotypes are there for earlobes?
The genotype of an organism is the actual alleles that it has. The phenotype of an organism is the way that organism looks or the trait that it has. If a person’s genotype was Ee, then their phenotype would be unattached earlobes. In the above example, we saw that there are 3 different genotypes: EE, Ee and ee.
Which could be the genotype for someone with attached earlobes in humans unattached earlobes are dominant over attached earlobes?
In humans, “unattached” earlobes are dominant over “attached” earlobes. … Use E and e for the earlobe phenotype alleles and W and w for the hairline phenotype alleles. A woman with unattached earlobes and a widow’s peak and a man with attached earlobes and a widow’s peak have a child.
What does it mean if your earlobes are attached?
Earlobes of such type are small in size and are attached directly to the side of the head. This kind of lobe’s structural formation is due to the absence of the dominant allele in the chromosomes. The recessive allele is expressed to form an attached earlobe.
Can two parents with attached earlobes?
So two parents with attached earlobes should not be able to have a child with unattached ones. Except that sometimes they do. Which means that earlobes are more complicated than is usually advertised. In one of the first earlobe studies, scientists concluded that unattached earlobes were dominant over attached ones.
How is earlobe attachment inherited?
Consider earlobe attachment. A single autosomal gene with two alleles determines whether you have attached earlobes or free-hanging earlobes. The allele for free-hanging earlobes (F) is dominant to the allele for attached earlobes (f). Other single-gene autosomal traits include widow’s peak and hitchhiker’s thumb.
Is PP genotype or phenotype?
Predicting Offspring Phenotypes
Only offspring with the pp genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.
Can you have both attached and unattached earlobes?
No, they won’t have one attached and one unattached. In the case of the earlobe genes, one is dominant over the other. This means that when they are both together, one gene will be expressed and the other will not be expressed.
What is the genotype of the heterozygote?
Listen to pronunciation. (HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).
Can earlobes attached over time?
Some scientists suggest ear growth may be due to the skin losing elasticity over time, making the tissue of the ears sag and stretch. And earlobes heavy with earrings may gradually droop under their weight. This video, from a 1998 BBC documentary The Human Body: As Time Goes By, illustrates how ears change over time.
Why do I have one attached earlobe and one unattached earlobe?
Originally Answered: Why do people have attached and unattached earlobes? It’s just a simple genetic trait. Unattached/free-hanging earlobes are dominant and attached is recessive. You get one alele (version of this trait) from each biological parent.
What are ear lobes?
The earlobe (lobulus auriculae) is the soft, fleshy part of the outer ear. Without cartilage, the earlobe contains a large blood supply with many nerve endings. For some, the earlobes are an erogenous zone. Genetics play a part in whether the earlobes are attached to the neck or if they dangle free.
Can attached earlobes be pierced?
If you have ears that are noticeably higher or lower than the other or you have attached earlobes with less than 1/8th of an inch of lobe all the way around where you would be placing the piercing then earring of any kind are strongly discouraged.
What ears say about you?
If the lower part of the ear is thick, such people are likely to be emotional. People having small ears will be shy and introverts. These traits will be more pronounced in persons having long and narrow ears. Those sporting medium-sized ears may be energetic and determined personalities.