- 1 Which of the following does not follow Mendel’s laws?
- 2 Which of the following types of traits are governed by more than one genetic locus?
- 3 What produces the new alleles at a locus?
- 4 Which is not true about polygenic traits?
- 5 What are three exceptions to Mendel’s observations?
- 6 What are the four exceptions to Mendelian rules?
- 7 What is multiple alleles give an example?
- 8 What is a recessive allele?
- 9 What are the 3 types of genotypes?
- 10 What is allele example?
- 11 How do multiple alleles arise?
- 12 How many alleles do humans have?
- 13 What are the characteristics of polygenic inheritance?
- 14 What are some examples of polygenic inheritance?
- 15 Is height a polygenic trait?
Which of the following does not follow Mendel’s laws?
There are many types of inheritance that do not follow the Mendelian pattern. Notable ones include: multiple alleles, gene interactions (complementary genes, epistasis and quantitative or polygenic, inheritance), linkage with or without crossing over and sex-linked inheritance.
Which of the following types of traits are governed by more than one genetic locus?
A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic.
What produces the new alleles at a locus?
New alleles at a genetic loci arise because of mutation. Mutations occur when there is an alteration in the sequence of DNA.
Which is not true about polygenic traits?
Which statement concerning polygenic traits is not true? – They are governed by more than one genetic locus. -Their expression is often influenced by genetic/environmental interactions. All human genetic disorders are inherited as recessive traits.
What are three exceptions to Mendel’s observations?
The three exceptions to Mendel’s observations are codominance, incomplete dominance and pleiotropy.
What are the four exceptions to Mendelian rules?
- Multiple alleles. Mendel studied just two alleles of his pea genes, but real populations often have multiple alleles of a given gene.
- Incomplete dominance.
- Lethal alleles.
- Sex linkage.
What is multiple alleles give an example?
multiple alleles Three or more alternative forms of a gene (alleles) that can occupy the same locus. For example, the ABO system of blood groups is controlled by three alleles, only two of which are present in an individual.
What is a recessive allele?
Definition. A type of allele that when present on its own will not affect the individual. Two copies of the allele need to be present for the phenotype to be expressed.
What are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.
What is allele example?
The definition of alleles are pairs or series of genes on a chromosome that determine the hereditary characteristics. An example of an allele is the gene that determines hair color. Any of the alternative forms of a gene or other homologous DNA sequence.
How do multiple alleles arise?
Multiple alleles exist in a population when there are many variations of a gene present. In both haploid and diploid organisms, new alleles are created by spontaneous mutations. These mutations can arise in a variety of ways, but the effect is a different sequence of nucleic acid bases in the DNA.
How many alleles do humans have?
Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. Each pair of alleles represents the genotype of a specific gene.
What are the characteristics of polygenic inheritance?
Polygenic Inheritance characteristics
- Polygene refers to a gene that exerts a slight effect on a phenotype along with other genes.
- Effect of a single gene is too small, so it is difficult to detect.
- Multiple genes produce an equal effect.
- Each allele has a cumulative or additive effect.
What are some examples of polygenic inheritance?
Some examples of polygenic inheritance are: human skin and eye color; height, weight and inteligence in people; and kernel color of wheat.
Is height a polygenic trait?
Because height is determined by multiple gene variants (an inheritance pattern called polygenic inheritance), it is difficult to accurately predict how tall a child will be.