Polydactyly is a condition in which a person has more than five fingers per hand or five toes per foot. It is the most common birth defect of the hand and foot. Polydactyly can occur as an isolated finding such that the person has no other physical anomalies or intellectualRead More →
Infantile spasms (also called West syndrome) can be caused by problems with the way the brain developed in the womb, infections, brain injury, or abnormal blood vessels in the brain (such as an arteriovenous malformations). Infantile spasms also can happen in babies with some types of metabolic and genetic disorders.Read More →
But they’re normal based on the reality that they grow from strength training like any other muscle group. Therefore, the main reason why you might wind up with forearms bigger than biceps is that you’re simply training your lower arms harder and heavier than your upper arms. Can everyone getRead More →
Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I. Which processes increase variation during meiosis? Meiosis also producesRead More →
Genetic polymorphism is a difference in DNA sequence among individuals, groups, or populations. Sources include single nucleotide polymorphisms (SNPs), sequence repeats, insertions, deletions, and recombination. … SNPs are the most common type of genetic variations in humans. How are polymorphisms created? A discontinuous genetic variation divides the individuals of aRead More →
So modern life is a compromise between those two influences. But what’s interesting about the human brain is that selfishness appears to be learned behavior, not instinctive. Do humans have a selfish gene? The “selfish gene” was a metaphor used by Dawkins to explain gene-based evolution. Genes are not literallyRead More →
A mutation is a change in a genetic sequence. Mutations include changes as small as the substitution of a single DNA building block, or nucleotide base, with another nucleotide base. Meanwhile, larger mutations can affect many genes on a chromosome. Is a mutation a genetic defect? Sometimes there is aRead More →
In addition to the preference vs relative hand skill dichotomy, handedness can be regarded as a discrete variable in terms of its direction (e.g., Caplan and Kinsbourne, 1981), but can also be treated as continuous if one focuses on the degree (or strength) of handedness (e.g., Resch et al., 1997).Read More →
For example, the chance of having a baby with Trisomy 18 is higher in older mothers. In other cases, Trisomy 18 can be inherited due to a familial chromosome rearrangement called a translocation. Trisomy 18 is never the result of anything a mother or father did, or didn’t do. WhatRead More →
Listen to pronunciation. (jeh-NEH-tik uh-NA-lih-sis) The study of a sample of DNA to look for mutations (changes) that may increase risk of disease or affect the way a person responds to treatment. What are genetic analysis tools? Various types of genetic analysis. Genetic analyses include molecular technologies such as PCR,Read More →