Related Experiment Video
Updated: May 4, 2026
04:56
An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice
Published on: March 28, 2025
1.9K
Variation in sex ratio between progeny groups in dairy cattle
1Ministry of Agriculture, Tel Aviv, Israel.
Summary
Differences in male calf proportions were observed in Israeli-Frisian cattle. These variations suggest a potential genetic influence on sex ratio within cattle breeds.
Area of Science:
- Animal Science
- Genetics
- Reproductive Biology
Background:
- The sex ratio of offspring is a critical factor in livestock breeding efficiency.
- Variations in sex ratio can impact herd management and economic outcomes in cattle populations.
Purpose of the Study:
- To investigate the significant differences in progeny sex ratios within the Israeli-Frisian cattle breed.
- To explore the potential genetic basis for observed variations in male calf proportions.
Main Methods:
- Statistical analysis of progeny group data from Israeli-Frisian cattle.
- Estimation of standard deviations for male proportion across different groups.
- Correlation analysis between sire-son and half-sib relationships concerning sex ratio.
Main Results:
- Highly significant differences were identified between progeny groups in the Israeli-Frisian breed.
- The standard deviation for the proportion of males between groups was estimated at 1.5%.
- Significant correlations were found between sire and son, and between half-sibs regarding progeny sex ratio.
Conclusions:
- The observed differences in sex ratio among Israeli-Frisian cattle progeny are statistically significant.
- Evidence suggests a potential genetic component influencing the sex ratio in this cattle breed.
- Further research into the heritability of sex ratio in cattle is warranted.
Related Concept Videos
02:45The Ratio of X Chromosome to Autosomes
11.5K
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...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
11.5K
02:46Chi-square Analysis
28.9K
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...
28.9K
01:49Law of Segregation
58.0K
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
58.0K
01:24Testing a Claim about Population Proportion
2.9K
A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
2.9K
02:50Dosage Compensation
6.3K
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
6.3K
02:03Law of Independent Assortment
46.6K
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
46.6K