Gregor Mendel showed that unit factors exist in pairs and exhibit dominant-recessive relationship. These unit factors, in modern terminology are called as

Genes

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Alleles

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Loci

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Determinants

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Genes
According to Mendel, a pair of the contrasting trait is governed by two determinants or unit factors; for example, plant contained two determinants unit factors for the characteristic of height. A heterozygous individual carries two contrasting factors of a trait; the factor that can express itself is called as the dominant factor. The other factor whose effect is masked by the presence of dominant factor is called recessive factor. A gene is the unit of heredity that determines a particular trait; each gene has at least two contrasting forms that determine the contrasting phenotype for that trait. These alternate forms of a gene are called allele. Thus, Mendelian factors and determinants are synonymous with genes, not with alleles, in modern terminology; option B is incorrect and A is correct. Loci are the specific position of genes on a chromosome; that are the position of unit factors of the chromosome which makes option C incorrect.

Suggest Corrections

Similar questions

Q. Mendel showed that unit factors, now called alleles, exhibit a dominant/recessive relationship. In a monohybrid cross, the .................... trait disappears in the first filial generation.

Consider the following statements and select the options stating which ones are True (T) and which ones are False (F) on the basis of Mendel’s law of dominance.

i. The discrete unit controlling a particular character is called a factor.

ii. Factors occur in pairs known as alleles, of which one is recessive while the other one dominant.

iii. Alleles show blending and both the traits do not recover as such in $F_{2}$ generation.

iv. Factors occur in pairs.

Which among the following statements is/are correct with respect to the law of dominance?

A. Each character is controlled by pair of discrete units called factors.

B. In a dissimilar pair of factors one is dominant and the other is recessive.

C. It explains the expression of one trait in $F_{1}$ and both traits in $F_{2}$ generation.

D. Explains the proportion of phenotypes, 3:1 obtained in $F_{2}$ generation.

Q. Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor'.
(a) Give the modern name for this 'factor'.
(b) State where these factors are found in gametes.

Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors?

Join BYJU'S Learning Program