Genetics and Plant Breeding

Mendel's primary contributions to genetics are summarized in three laws: the Law of Dominance, the Law of Segregation, and the Law of Independent Assortment. While linkage and mutations are important genetic concepts, they were discovered and described by later scientists like Morgan and de Vries.

The appearance of both tall and dwarf plants in the F2 generation from a heterozygous tall plant demonstrates that the alleles separate or segregate from each other during gamete formation, which is Mendel's Law of Segregation.

A cross between an F1 hybrid (Tt) and a recessive parent (tt) is a test cross. The resulting offspring will be 50% Tt and 50% tt, yielding a 1:1 phenotypic ratio.

Crossing over occurs during meiosis and involves the exchange of genetic material between non-sister chromatids of homologous chromosomes, which leads to new combinations of linked genes.

A cross involving two pairs of alleles (e.g., RrYy x RrYy) is defined as a dihybrid cross, as it tracks two distinct traits simultaneously.

 An individual with two identical numbers of a pair of genetic factors is called homozygous

This is the correct answer because when two species of the same genus are crossed, it is known as interspecific hybridisation.

Hexaploid wheat (Triticum aestivum) evolved through hybridization involving Aegilops squarrosa (also known as Triticum tauschii) as the D-genome donor.

Triticale is a man-made hybrid created by crossing wheat (Triticum) and rye (Secale). It is an allopolyploid (specifically an allotetraploid or allohexaploid depending on the cross).

Yes, this is the correct answer. Both statements are true. A tree representation of a family showing the relationships between members and the pattern of inheritance of a given trait is known as pedigree. Unweighted Pair Group Method with Arithmetic Mean (UPGMA) is a distance-based method in tree construction.

Gregor Mendel, the father of genetics, famously used Pisum sativum, or garden peas, for his foundational experiments on inheritance.

This is the correct option. The function of chromosome is to transfer the characteristics from the parents to the offsprings through the genes.

The higher concordance rate for genetically identical monozygotic compared to the genetically non-identical dizygotic twins brought up in the same environment clearly favours a strong genetic element.

An intergeneric cross involves breeding between two different genera, which represents a very distant relationship compared to intervarietal or interspecific crosses.

Heterosis, or hybrid vigour, is the phenomenon where the progeny of two genetically diverse parents exhibit superior traits compared to the parents.