Thus, it was surprising to find that two homozygous FH patients referred to a single hospital in the UK were both apparently homozygous for the Pro664Leu mutation. One, an Asian patient, was a true homozygote. The other, of English origin, had inherited two different alleles of the LDL-...
A breeding experiment between two species that are similar hybrids for two traits is known as a dihybrid cross. A dihybrid cross, to put it another way, is a cross between two species that are heterozygous for two different traits. This type of trait has individuals...
CStrength of linkage is not dependent upon the distance between the genes DIt depends upon the nature of the concerned genesSubmit Linkage refers to ACo-inheritance of two alleles of the same gene BAttached X-chromosomes in Drosophila CCo-inheritance of two different genes DRole of sex-chromosom...
Codominance is a form of inheritance in which two different alleles for a gene are both expressed, and neither allele is dominant over the other. The alleles for type A blood and type B blood are What are multiple alleles? Is there dominance in multiple alleles?
Several evolutionary theories propose that the first step in the evolution of sex chromosomes is the appearance of an autosomal gene with two different alleles, where homozygosity leads to the development of one sex and heterozygosity to the other. Once this occurs, there is a suppression of ...
How are sex-linked pedigrees different from autosomal pedigrees? What is the relationship between genes, alleles and genotypes? Explain. Recessive genes are usually expressed in humans in what circumstances? What pattern of inheritance do the traits in each of the following pedi...
When two different alleles for the same trait are found in an organism, the gene that is expressed is thedominant allele, and the gene not expressed is therecessive allele. If red is dominant over white in flowers, the offspring between a homozygous red and white flower should all be red....
Digenic inheritance is the simplest form of multigenic inheritance for a genetic disorder when variants or mutations on two different genes are required to cause the condition. Having a mutation on one gene is necessary but not sufficient to cause a condition. An example of digenic inheritance is...
Costs of female cones that are unfertilised or aborted (see point ii below) are also part of female allocation. Sex allocation is dictated by nuclear alleles and r can take on any value between 0 and 1. With r = 0 the plants is female, with r = 1 it is male and at ...
• Traits are distinct - Characteristics are discrete. For instance, the combination of alleles in having blue eyes is different from the combination involved in having brown eyes. • Traits have alternate forms - This means that a gene displays separation of two alleles. For instance, an in...