In humans, the allele for short fingers is dominant over that for long fingers. If a person with short fingers who had a parent with long fingers marries a person with long fingers, what are the chances for a child to have short fingers? a. All or 100% b. (2024)

FAQs

In humans, the allele for short fingers is dominant over that for long fingers. If a person with short fingers who had a parent with long fingers marries a person with long fingers, what are the chances for a child to have short fingers? a. All or 100% b.? ›

Answer and Explanation:

The condition is genetic, which means one of your parents can pass the condition onto you (autosomal dominant). In many cases, there is a history of the condition in a person's family.

Offspring need to carry just one dominant allele from their parents to inherit the polydactyly condition.

It is stated that the long finger trait is a recessive trait with 80% penetrance which means that even if the genotype suggests that the trait will be observable, it is only 80% of the time.

There are two different alleles for the number of fingers on the hands: five-finger allele and six-finger allele. When both the five-finger allele and the six-finger allele are present in the same individual, the individual has six fingers on each hand.

Postaxial polydactyly type-A (PAP-A) in humans is an autosomal dominant trait characterized by an extra digit in the ulnar and/or fibular side of the upper and/or lower extremities.

Since short is recessive, the only genotype that will result in a short appearance is tt. tt occurs one time on the Punnett square, out of four possible combinations; therefore, there is a 1-in-4 chance of giving birth to a short child, or 25%.

Having six fingers is a dominant trait!

If the allele encoding polydactyly (six fingers) is dominant why do most people have five fingers? Genetic elements suppress the polydactyl gene. Polydactyly is embryonic lethal. The sixth finger is removed at birth.

A dominant allele is an allele that is always expressed in the phenotype if it is present in the genotype. Therefore, the genotypes that could produce polydactyly are uppercase D uppercase D or uppercase D lowercase d. Basically, an individual only needs to have one dominant allele in order to express polydactyly.

What finger is dominant? ›

It is commonly believed that the index finger is the most “dominant” finger: “It serves to exemplify the pre- cise movements of the human hand” (Crow, 1974). The index finger is also commonly the finger of choice for reconstruction of a usable thumb (Littler, 1953).

The index finger was the most dominant in 82.5% of the test group. However, in 10.6% of the test group, the middle finger was found to be the most dominant.

The fingers on your dominant hand are usually slightly bigger than on your non-dominant hand. Be mindful of swelling. Your fingers swell up in the heat and shrink in the cold.

Having extra fingers (polydactyly) is a dominant trait. Having just 10 fingers is a recessive trait.

Alleles are described as either dominant or recessive depending on their associated traits. Most human cells carry two copies of each chromosome, so usually have two versions of each gene. These different versions of a gene are called alleles.

Dominant refers to the inheritance of traits that are typically passed vertically from parent to child where both the parent and the child are affected by the trait or disorder that is related to that gene.

Brachydactyly is a congenital condition that a person is born with. It leads to someone's fingers and toes being much shorter than average compared to the general size of their body.

And surprisingly, having five fingers in these cases is usually a recessive trait. When people or animals are born with extra fingers this typically dominant trait is called polydactyly. The same is true for the much more rare ectrodactyly, when people are born missing digits.

The allele for bent pinkie fingers is dominant (B). The allele for straight pinkie fingers is recessive (b).