What is the name given to the most common phenotype in a natural population?
wild type
Which of these descriptions of the behavior of chromosomes during meiosis explains Mendel’s law of segregation?
Which of these descriptions of the behavior of chromosomes during meiosis explains Mendel’s law of segregation? The two alleles for each gene separate as homologous chromosomes move apart during anaphase I. … The male gamete determines sex because each male gamete can contribute either an X or a Y chromosome.
What is the reason that closely linked genes are typically inherited together quizlet?
Why do linked genes tend to be inherited together? Because they are located near each other on the same chromosome.
What is the most common phenotype?
DCCee was the most prevalent phenotype in our study with the phenotype distribution being significantly different between our study and other studies from different regions of the world.
What is Mendel’s first law of segregation?
1 Character Traits Exist in Pairs that Segregate at Meiosis. … This is the basis of Mendel’s First Law, also called The Law of Equal Segregation, which states: during gamete formation, the two alleles at a gene locus segregate from each other; each gamete has an equal probability of containing either allele.
What is the principle of segregation?
The Principle of Segregation describes how pairs of gene variants are separated into reproductive cells. The segregation of gene variants, called alleles, and their corresponding traits was first observed by Gregor Mendel in 1865. From his data, Mendel formulated the Principle of Segregation. …
How did Mendel prove segregation?
Mendel proposed the Law of Segregation after observing that pea plants with two different traits produced offspring that all expressed the dominant trait, but the following generation expressed the dominant and recessive traits in a 3:1 ratio.
What is the greatest benefit of having used a Testcross for this experiment?
What is the greatest benefit of having used a testcross for this experiment? The phenotypes of the progeny reveal the allelic content of the gamete from the heterozygous parent.
What is a gene definition?
A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. … Alleles are forms of the same gene with small differences in their sequence of DNA bases.
What is the source of the extra chromosome 21 in an individual with Down syndrome?
TRISOMY 21 (NONDISJUNCTION)
Down syndrome is usually caused by an error in cell division called “nondisjunction.” Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.
What is phenotype example?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
Can a person’s genotype be determined by their phenotype?
Answer and Explanation:
No, a person’s genotype cannot be determined solely by their phenotype as many genes in our genome do not get expressed.