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I need just an overview about the patterns of inheritance, w/c are dominant, sex-linked, and recessive. I've searched some sites but they made me confused even more so I just need a brief explanation for each of these. Thanks.

2007-02-22 22:41:40 · 3 answers · asked by Anonymous in Science & Mathematics Biology

3 answers

A dominant pattern of inheritance means you just need one copy of the gene for it to be expressed. For example, if P is a dominant trait and p is a recessive trait, an individual having either Pp or PP genes will express that trait. A recessive patter of inheritance means you need to have both copies of the gene to be expressed. So only an individual with pp genes will express that trait. A sex linked pattern of inheritance means the gene is on the X or Y chromosome. These genes on the X chromosome can also be dominant or recessive, but the genes on the Y chromosome are alway expressed. If the gene is on the X chromosome and it's dominant, all males and females will express it. If the gene on the X chromosome is recessive, all males will that gene will express it as well as all females with two copies of that gene. Naturally, all males with the gene on the Y chromosome will express it but since females don't have a Y chromosome, it doesn't affect them.

2007-02-22 22:58:42 · answer #1 · answered by Bob 3 · 0 0

Humm Dun comprehend. My mom and father Have Brown Eyes, and that i've got green. My Grandmother on My mothers section Has green Eagle Eye's so i assume i'm getting them from Her. and My Brother and Sister have Blue Eyes and My Dads Grandmother Had Blue Eyes So i assume it could leap Generations..

2016-10-16 07:39:29 · answer #2 · answered by pape 4 · 0 0

Inheritance patterns trace the transmission of genetically encoded traits, conditions or diseases to offspring. There are several modes of inheritance: Single Gene or Mendelian
Multifactorial
Mitochondrial

Note: These explanations use pedigrees to illustrate inheritance patterns. If you are unfamiliar with pedigrees, see Pedigrees for an explanation of the symbols.
Genetic conditions caused by a mutation in a single gene follow predictable patterns of inheritance within families. Single gene inheritance is also referred to as Mendelian inheritance as they follow transmission patterns he observed in his research on peas. There are four types of Mendelian inheritance patterns:

Autosomal dominant
Autosomal recessive X-linked recessive
X-linked dominant
Autosomal: the gene responsible for the phenotype is located on one of the 22 pairs of autosomes (non-sex determining chromosomes).
X-linked: the gene that encodes for the trait is located on the X chromosome.

Dominant: conditions that are manifest in heterozygotes (individuals with just one copy of the mutant allele).

Recessive: conditions are only manifest in individuals who have two copies of the mutant allele (are homozygous).

Dominant conditions are expressed in individuals who have just one copy of the mutant allele. The pedigree on the right illustrates the transmission of an autosomal dominant trait. Affected males and females have an equal probability of passing on the trait to offspring. Affected individual's have one normal copy of the gene and one mutant copy of the gene, thus each offspring has a 50% chance on inheriting the mutant allele. As shown in this pedigree, approximately half of the children of affected parents inherit the condition and half do not Dominant conditions are expressed in individuals who have just one copy of the mutant allele. The pedigree on the right illustrates the transmission of an autosomal dominant trait. Affected males and females have an equal probability of passing on the trait to offspring. Affected individual's have one normal copy of the gene and one mutant copy of the gene, thus each offspring has a 50% chance on inheriting the mutant allele. As shown in this pedigree, approximately half of the children of affected parents inherit the condition and half do not

Dominant conditions are expressed in individuals who have just one copy of the mutant allele. The pedigree on the right illustrates the transmission of an autosomal dominant trait. Affected males and females have an equal probability of passing on the trait to offspring. Affected individual's have one normal copy of the gene and one mutant copy of the gene, thus each offspring has a 50% chance on inheriting the mutant allele. As shown in this pedigree, approximately half of the children of affected parents inherit the condition and half do not

Because the gene is located on the X chromosome, there is no transmission from father to son, but there can be transmission from father to daughter (all daughters of an affected male will be affected since the father has only one X chromosome to transmit). Children of an affected woman have a 50% chance of inheriting the X chromosome with the mutant allele. X-linked dominant disorders are clinically manifest when only one copy of the mutant allele is pre

2007-02-23 01:26:19 · answer #3 · answered by veerabhadrasarma m 7 · 0 0

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