Which statement describes an example of the law of independent assortment?
A. Offspring inherit two different versions of each gene, but onl
is expressed.
B. The alleles for a parent’s traits are organized into gametes
independently of one another.
OC. The factors that determine a trait mix together during gamete
formation.
D. Parental traits and offspring traits are determined independer
of one another.
The Correct answer and Explanation is:
The correct answer is B. The alleles for a parent’s traits are organized into gametes independently of one another.
Explanation of the Law of Independent Assortment
The law of independent assortment is one of the key principles of Mendelian genetics, formulated by Gregor Mendel based on his experiments with pea plants. This law states that the alleles for different genes segregate independently of one another when forming gametes. In simpler terms, the inheritance of one trait will not affect the inheritance of another trait. This principle applies to genes that are located on different chromosomes or are far apart on the same chromosome.
To illustrate this, consider a dihybrid cross involving two traits, such as seed shape (round vs. wrinkled) and seed color (yellow vs. green). If we denote round as R (dominant) and wrinkled as r (recessive), and yellow as Y (dominant) and green as y (recessive), a parent with genotype RrYy can produce four types of gametes: RY, Ry, rY, and ry. The combination of these gametes during fertilization results in offspring with varying combinations of traits, demonstrating that the segregation of alleles for seed shape does not influence the segregation of alleles for seed color.
This law is critical for understanding genetic variation and the combinations of traits that can occur in offspring. It helps explain why traits appear in a variety of combinations and why certain traits can appear to be inherited together or separately across generations.
The law of independent assortment assumes that genes are located on different chromosomes or are far apart on the same chromosome; if genes are closely linked, they may not assort independently. Thus, this law lays the groundwork for predicting genetic ratios in offspring and forms the basis for further studies in genetics, including the understanding of genetic linkage and recombination.