What type of variation is tongue rolling?
The ability to roll the tongue, and blood groups, are examples of discontinuous variation.
What is an example of heterozygous genotype?
Together, these alleles are called a genotype. If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair.
Is being able to roll your tongue rare?
It is one of the rarest tricks. According to a study published in the journal Dysphagia, 83.7% of the population could roll their tongue.
Can you train your tongue to roll?
The only explanation is that tongue rolling is not controlled by simple genetics as everyone first thought. Further studies even found that about 10 percent of those people who can’t roll their tongue can be trained to roll it. So if you can’t roll your tongue now, there is a small chance you can learn how.
Is rolling your R’s genetic ability?
There’s no real equivalent in English to the rolled ‘r’. That’s what makes it so notoriously hard for native English speakers who are used to the very hard R sound. Despite this, it is possible to learn this skill. Being able to roll your ‘r’s isn’t a genetic trait like, say, being able to roll your tongue.
Is heterozygous dominant?
Difference between homozygous and heterozygous
Unlike homozygous, being heterozygous means you have two different alleles. You inherited a different version from each parent. In a heterozygous genotype, the dominant allele overrules the recessive one. Therefore, the dominant trait will be expressed.
Is WWW heterozygous or homozygous?
WW and ww are described as homozygous. The genotypes WW and Ww will produce a widow’s peak (the dominant phenotype) and the ww genotype will produce no widow’s peak (the recessive phenotype).