If the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.

monosomy

Key Concepts

Haploid and Diploid Numbers

The haploid number (n) refers to the number of chromosomes in a gamete, which is half the total number of chromosomes in a diploid organism. In this case, if the haploid number for the plant species is 4, the diploid number (2n) would be 8. Understanding these terms is crucial for determining chromosome counts in various genetic scenarios.

Monosomy

Monosomy is a type of aneuploidy where one chromosome from a pair is missing, resulting in a total of one less chromosome than the diploid number. For a plant with a diploid number of 8, monosomy would mean that one chromosome is absent, leading to a total of 7 chromosomes in that individual. This concept is essential for analyzing the genetic implications of chromosome loss.

Chromosome Structure and Function

Chromosomes are structures within cells that contain DNA and proteins, playing a critical role in heredity and gene expression. Each chromosome carries specific genes that determine traits. Understanding chromosome structure helps in grasping how changes in chromosome number, such as those seen in monosomy, can affect the organism's phenotype and overall health.