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What is the probability that a woman who is a carrier of the colorblind gene and a color blind man will have a first son who will be color blind?
The probability is 0 (but the daughter will be a carrier of the color blind gene). This is because the gene dictating whether someone is color blind or not is linked to the X chromosome (and not the Y). The color blind gene is a recessive gene whilst the normal color vision gene is a dominant gene. Hence if a girl (XX) has one normal vision gene (from one parent) and one color blind gene (from the other parent), her normal vision gene will be dominant to the recessive color blind gene and hence she will have normal vision (but she will be a carrier of the color blind gene). If both her parents contribute the recessive color blind gene to her, then she will be color blind. For a woman (XX) to be color blind, she needs to be have both genes to be recessive (ie where there is no dominant normal color vision gene to dominate). For a man (XY), as long as the X gene contributed by his mother is a color blind gene, he will be color blind because he has no other X chromosome where a dominant normal color gene could reside. Hence, to answer the question, a man with normal color vision (XY, with a dominant normal color vision X gene since the gene can't be the recessive color blind gene otherwise he will be colorblind) and a colorblind woman (XX, both recessive color blind genes), will each contribute an X each the child. The man will contribute his only X chromosome which carries the normal color vision X gene and the woman can only contribute a recessive color blind gene. The man's normal color vision X gene will be dominant, and hence the daughter will definitely have normal vision (despite being a carrier).
What is the probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder?
75%. Explanation: if both parents are carriers than their Gametes would be Dd x Dd, resulting in DD (1/4), Dd (2/4), and dd(1/4), meaning that there is a 25% chance that they will have a child that has the disorder. DD = A normal child that lacks the recessive gene, therefore not a carrier Dd = A normal child that carries the recessive gene dd = A child with the disorder + carries the gene, hence the child's future offspring will carry it as well. Source: Self/Basic Punnet Square
Who invented central tendency?
Gene Allen Holland
How many red heads are there?
Red hair is a genetic mutation. To have red hair, you need to inherit two recessive genes (one from the father, one from the mother). Inheriting one recessive gene will make you a carrier, but you will not have red hair. Because of this, it's a fairly low proportion of the world population- around 1-2%. With a world population of 7,000,000,000 though, this adds up to around 140,000,000. Redheads are most heavily concentrated in Western/Northern Europe (Europe as a whole is 4% red head), the US and Australia (although they are found around the world). Within a gene-pool, carriers of the recessive gene repeatedly having children together leads to high concentrations of offspring with two recessive genes, and so concentrated populations of red heads. The highest proportion of red heads in the world is in Scotland, at around 13%, followed by Ireland at 10%. In terms of numbers, the US (at 2-6%) has the largest red-headed population.
Explain what the term relative frequency means?
Number of times an allele occurs Ina gene pool camparing it's placement with that of fossils on other layers of rock
How are terms gene locus and allele related?
A gene locus refers to the specific position of a gene on a chromosome, while an allele refers to different versions of the same gene that can exist at a particular locus. In other words, a gene locus is the physical location of a gene on a chromosome, while an allele is a specific variant or form of that gene found at that locus.
What is the definition of locus?
The particular site where a gene is found on a chromosome.
Is gene mutation and mutation is same?
Yes, gene mutation and mutation are often used interchangeably in biological contexts. Gene mutation specifically refers to a change in the sequence of DNA in a particular gene, whereas mutation can refer to changes in DNA sequences more broadly, including those not within a specific gene.
What name is given to the specific location of a gene on a chromosome?
The specific location of a gene on a chromosome is called a locus. It is where the gene is positioned along a chromosome, and each gene has a unique locus.
Alleles of a gene are found at the same locus on heterologous chromosome true or false?
False. Alleles of a gene are found at the same locus on homologous chromosomes. Heterologous chromosomes do not contain alleles of the same gene at the same locus.
What do you call the physical location of a gene?
The specific term is gene locus. If the exact location is known then there is more specific terminology that refers to the chromosome number whether the locus is on the short (p) or long (q) arm of the chromosome and it's specific location based on band and sub-band location.
Where genes for a certain trait are located?
Genes for a certain trait are located on specific regions of chromosomes. Each gene occupies a particular locus on a chromosome, and variations in these genes can result in different expressions of the trait. The specific location of a gene on a chromosome is referred to as its genetic map position.
What is the difference between a variation and a mutation?
mutation is an alteration in the nucleotide sequence of a gene whereas variation is any difference between individuals of a particular species.
Is the probability of a mutation in any given gene is greater than 3 percent?
The probability of a mutation in any given gene being greater than 3 percent is considered relatively high. This level of mutation frequency may indicate increased genetic variability or potential for genetic disorders within a population.
A change in a gene is called?
A mutation
What is the difference between a factor and an allele?
A factor is a gene that controls a specific trait, while an allele is a specific form of that gene. For example, the gene for eye color is a factor, and the different alleles (blue, brown, green) represent the various forms of that gene that can determine an individual's eye color.
Is Huntington's Disease a gene mutation?
No, it's caused by a single point mutation of a gene.
