Because if they are dominant, then even one copy present in the organism would mean that the organism will be killed by the generic error (because they are fatal).
Thus to be passed on they have to be recessive - in other words if an individual has a good copy and a bad copy (genes are paired - one from the mother and one from the father) the good copy must be dominant for the individual to survive.
explain how dominant genes work
A dominant gene- A gene That is "stronger" than a recessive geneA recessive gene- A gene that must have 2 of the same to have that look.ex: A gene for being tall=T (CAPITAL T)A gene for being short=t(lowercase t)TT=TallTt=talltt=shortThe GENES WHICH ARE EXPRESSED IN THE PROGENY ARE CALLED DOMINANT AND WHICH DO NOT EXPRESS ARE CALLED RECESSIVE
six basic principles of genetics are....Traits, or characteristics, are passed on from one generation of organisms to the next generationThe traits of an organism are controlled by genesOrganisms inherit genes in pairs, one gene from each parentSome genes are dominant, whereas other genes are recessiveDominant genes hide recessive genes when both are inherited by an organismSome genes are neither dominant nor recessive. These genes show incomplete dominancesource: i got this from my textbook.....and im in 7th grade. the txtbook is called Prentice Hall Exploring Life Science
dominant genes are more likely to be passed down to a child than recessive genes. Here's an example: A woman has black hair and blue eyes. Her husband has blonde hair and brown eyes. Their child will most likely have brown eyes and black hair, because black hair and brown eyes are dominant genes, while blonde hair and blue eyes are recessive. It is, of course, still possible for the child to be blonde and blue-eyed, only less likely. However, if the father had blue eyes too, it would be most likely that the child would have blue eyes. Grandparents are also a factor: say that both parents have blue eyes, but one or more of the child's grandparents (or anyone down the genetic line, actually) has brown eyes. It is therefore also possible for the child to have brown eyes. hope it helped
The question should be "If two alleles for a gene are the same, what phenotype will the organism have?" Answer: If the two alleles are for the dominant phenotype, the organism will exhibit the dominant phenotype. If the two alleles are for the recessive phenotype, the organism will have the recessive phenotype.
The dominant genes take over, and then the recessive genes hide away
Dominant genes are always expressed in preference to recessive genes in cased where both genes are present.
Recessive genes
Homozygous dominant for two dominant genes or homozygous recessive for two recessive genes.
Recessive genes do not become dominant. Dominant genes mask the expression of recessive genes in the presence of both alleles. However, if a recessive gene is selected for over time through breeding, it can become more prevalent in a population.
Their offspring will have dominant genes. However, if these offspring have offspring with an amimal with recessive genes, the recessive genes will show up.
The weaker of two genes is called the recessive gene. In the presence of a dominant gene, the recessive gene is not expressed in the organism's phenotype.
through dominate and recessive genes
Yes, dominant and recessive genes play a role in determining physical traits in offspring. Dominant genes are more likely to be expressed in the phenotype, while recessive genes are typically masked unless an individual inherits two copies of the recessive allele. This interplay between dominant and recessive genes contributes to the variety of physical characteristics seen in offspring.
Hair color is determined by genes inherited from parents. Dominant genes for hair color will be expressed over recessive genes, resulting in the dominant color being displayed. If both parents pass on recessive genes, the recessive color will be seen.
explain how dominant genes work
Yes, autosomes can carry lethal recessive genes. These genes can result in lethal genetic disorders when a person inherits two copies of the mutated gene, one from each parent, causing the disorder to manifest.