What is the percentage of having a carrier female offspring?
A woman who is a carrier has: a 25% (one in four) chance of having a daughter who is a carrier.
How does a girl become a carrier of hemophilia?
A female who inherits one affected X chromosome becomes a “carrier” of hemophilia. She can pass the affected gene on to her children. In addition, a female who is a carrier sometimes can have symptoms of hemophilia. In fact, some doctors describe these women as having mild hemophilia.
When two different alleles of a single gene are both expressed?
Codominance Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.
What are multiple alleles examples?
Two human examples of multiple-allele genes are the gene of the ABO blood group system, and the human-leukocyte-associated antigen (HLA) genes. The ABO system in humans is controlled by three alleles, usually referred to as IA, IB, and IO (the “I” stands for isohaemagglutinin).
When two different traits are investigated at the same time what type of cross does this represent?
When two different traits are investigated at the same time, what type of cross does this represent? Genes that are found on the X chromosomes, but not on the Y chromosome or on autosomes are, X-______genes. You just studied 41 terms!
What are the two main principles of Mendelian genetics?
The key principles of Mendelian inheritance are summed up by Mendel’s three laws: the Law of Independent Assortment, Law of Dominance, and Law of Segregation.
What are the four parts of the law of segregation?
First, it defines an allele. Second, it states that organisms inherit one allele from each parent. Third, it states that gametes only carry one allele for each trait. Fourth, it defines the difference between dominant and recessive genes.
Why is it a good choice for genetics studies?
These genetic and environmental similarities make it easier for scientists to spot rare differences in a population group that could be related to health or disease. Such studies also can help explain why some medical conditions are more common in certain population groups.
What is the offspring of crosses between parents with different traits?
The offspring of crosses between parents with different traits are called hybrids.
What do you inherit from each parent?
One copy is inherited from their mother (via the egg) and the other from their father (via the sperm). A sperm and an egg each contain one set of 23 chromosomes. When the sperm fertilises the egg, two copies of each chromosome are present (and therefore two copies of each gene), and so an embryo forms.