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Which genes are expressed even when present on only one chromosome?
Genes located on the X chromosome in males are expressed even when present on only one copy. This is because males have only one X chromosome and it is always active. In females, one of the two X chromosomes is randomly inactivated during early development, ensuring balanced gene expression.
Why are some genes are called dominant?
cause they can fool bi**
What are the difference between dominant and recessive genes?
Dominant genes will cover up recessive genes. Take a simplified version of eye color for example. Brown is dominant and blue is recessive. Someone might have the allele for both brown and blue, but their eyes will be brown because of the dominent brown gene. If there are two parents that carry the recessive gene, neither will be blue eyed, but they will have a chance of having a blue eyed child if both pass on the recessive gene.
How do two genes for different traits that are on the same chromosome can fail to be inherited together?
Two genes located on the same chromosome can fail to be inherited together due to a process called recombination or crossing over during meiosis. This occurs when homologous chromosomes exchange genetic material, resulting in new combinations of alleles. The likelihood of two genes being separated during recombination depends on their physical distance on the chromosome; genes that are farther apart are more likely to be separated than those that are close together. Thus, even though they are on the same chromosome, the genes can assort independently during gamete formation.
A chromosome is made up of even smaller bodies?
It is made up of genes.
What is the extract of RNA?
RNA is the expressed form of a gene (which is DNA encoded). By isolating RNA, it is possible to determine which genes were being expressed and to what relative (or even absolute) level.
Is it true that recessive alleles are never present when dominant alleles are present?
No, recessive alleles can still be present in an individual's genetic makeup even when dominant alleles are present. In this case, the recessive allele may not be expressed phenotypically, but can still be passed on to offspring.
How does sex related in inheritance be categories?
Sex-related inheritance can be categorized into two main types: sex-linked inheritance and sex-influenced inheritance. Sex-linked inheritance involves genes located on the sex chromosomes, primarily the X chromosome, where traits can manifest differently in males and females due to their differing sex chromosome compositions. In contrast, sex-influenced inheritance refers to traits that are expressed differently based on the sex of the individual, even though the genes are located on autosomes, such as the influence of hormones on the expression of certain traits.
What is the observable expression of the genes present and organisms?
The observable expression of genes in organisms is referred to as the phenotype. This includes traits such as physical appearance, behavior, and biochemical properties that result from the interaction of an organism's genotype (its genetic makeup) with environmental factors. The phenotype can vary widely even among individuals with the same genotype due to these interactions. Ultimately, the phenotype is a reflection of how genes are expressed and regulated in a given organism.
Why do males and females express X-linked alleles differently?
X-linked recessive traits that are not related to feminine body characteristics are primarily expressed in the observable characteristics, or phenotype of men. This is due to the fact that men only have one X chromosome. Subsequently, genes on that chromosome not coding for gender are usually expressed in the male phenotype even if they are recessive since there are no corresponding genes on the Y chromosome in most cases. In women, a recessive allele on one X chromosome is often masked in their phenotype by a dominant normal allele on the other. This explains why women are frequently carriers of X-linked traits but more rarely have them expressed in their own phenotypes.
Why do the recessive genes do not disappear from the population?
Recessive genes can persist in a population because they can be carried in individuals without being expressed. These hidden recessive genes can be passed down through generations, only showing up if inherited from both parents. Additionally, genetic diversity can help maintain recessive genes in a population even if they are not expressed in every generation.
How can two species have the same chromosome number yet have very different attributes?
See, The difference in two species comes from there genetic code (genes) and not from the number of chromosomes present in their cell.. So even if two species have same number of chromosomes BUT different genetic code then they ARE LIKELY TO BE DIFFERENT!! hope you have got your answer..:)
