Q. What type of individual is bred with an unknown genotypic individual during a test cross?
homozygous recessive
Q. How is a test cross performed?
To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait, and the offspring of the test cross are examined.
Q. What is a Testcross a mating between?
A testcross is a mating between an individual with a dominant phenotype (but unknown genotype) and a homozygous recessive individual. You can determine an individual’s genotype by simply looking at the physical appearance of that individual.
Q. How does test Cross help in identifying the genotype of an organism?
Detailed Answer :Test-cross helps to determine the unknown genotype by crossing it with the recessive parent. If in the progeny all are dominant type then the individual is homozygous and if in the Progeny dominant to recessive ratio is 1 : 1 the individual is heterozygous.
Q. What is the meaning of alleles?
Allele, also called allelomorph, any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome. Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.
Q. How are alleles and traits connected?
Traits are basically your phenotype. They include things like hair color, height, and eye color. Alleles are versions of genes. They are what directly specify what traits you have.
Q. What is the basic principle of genetics?
| 1. | that the inheritance of each trait is determined by “units” or “factors” that are passed on to descendents unchanged (these units are now called genes ) |
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| 2. | that an individual inherits one such unit from each parent for each trait |
