Related Experiment Videos
[Segregation ratio and heritability of lung cancer in Xuanwei County, China]
Zhonghua Yi Xue Za Zhi
|December 1, 1993
Abstract:
To determine the relation between genetic factor and lung cancer We selected 370 lung cancer probands in Xuanwei county, Yunan Province China. The data on 370 nuclear families were analysed. The segregation ratio of lung cancer was 0.15 and the genetic model of lung cancer belonged to polygenetics. The heritability of lung cancer was 24.6%, 14.6% for male and 37.8% for female. It is concluded that genetic factor is one of the risk factors for lung cancer is specially of importance for females, but it is not a main risk factor for lung cancer. Our results are helpful in complaining the high incidence of lung cancer in females in Xuanwei county.
Related Concept Videos
02:46Chi-square Analysis
The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an observed value. In the context of genetics, it enables us to either accept or reject a hypothesis, based on how much the observed values deviate from the expected values.
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...
02:45The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...