Question

A cross involving parents differ only in one trait is
A. Haploid
B. Diploid
C. Monohybrid
D. Dihybrid

Answer 1

Hint:-Genes, or alleles, come in multiple forms. With each chromosome, somatic cells produce two alleles, with each parent of an organism having one allele. It is always difficult to decide which two alleles of a gene are found within the chromosomes of an organism dependent solely on that organism's physical appearance. An allele, though, which is concealed, or not transmitted by an organism, will also be passed on to the descendants of that organism and transmitted in a later generation.

Complete answer:
The word used where a cell has half the normal number of chromosomes is haploid. Diploid cells, one group of chromosomes from each parent, form a typical eukaryotic population. However, the number of chromosomes in gametes is decreased by half following meiosis. It is the state of the haploid.

A cell or organism that has paired chromosomes, one from each parent, is diploid. Other than male sex cells, cells of humans are diploid and have 23 pairs of chromosomes. There is a single group of chromosomes in human sex cells (egg and sperm cells) and they are known as haploids.

A monohybrid cross is a genetic combination of two individuals with homozygous genotypes, or genotypes with entirely dominant or absolutely recessive alleles, which for a certain genetic trait result in opposite phenotypes. Geneticists use monohybrid crosses to observe how homozygous individuals' offspring transmit the heterozygous genotypes they inherit from their parents. This combination usually decides the dominant genotype. A monohybrid cross may also mean that two people who have heterozygous genotypes have a genetic combination. The superiority of an allele is verified by these crosses.

Dihybrid cross is a cross between two separate genes / lines that vary in the two features found. According to Mendel 's argument, there is a relationship of fully dominant-recessive features between the alleles of both these loci.

So from these discussions we can conclude that a cross involving parents differ only in one trait is Monohybrid.

Therefore the correct answer is option (C).

Note:- To test the molecular essence of Huntington's disease, a monohybrid cross was used. The aptly-named Huntingtin gene, the gene responsible for the complication, is borne by everybody. Scientists coupled the Huntingtin genes of an individual who is homozygous dominant for the disease (HH) with the Huntingtin genes of an individual who is homozygous recessive for the disease (hh) with this knowledge.