STD 12 - 4. principal of inheritance and variation — NEET STD 11 Science — Question

Which of the following statements are incorrect ?
(i) Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene.
(ii) T is used for the tall trait and t for the 'dwarf, and T and t are alleles of each other.
(iii) Allele may be homozygous, TT and tt, or heterozygous Tt.
(iv) To determine the genotype of a tall plant at F₂, Mendel crossed the tall plant from F₂, with a dwarf plant. This is called as test cross.
(v) In a typical test cross an organism showing a dominant phenotype is crossed with the any parent instead of self - crossing.
(vi) Based on his observations on monohybrid crosses Mendel proposed three general rules.

Which of the following is not a Porifera

Smooth muscle fibre differ from striated muscle fibre in external covering by

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin.This is the result of

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.

Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

The kidneys not only remove the waste products from the blood but also play a very important role in maintaining

During urine formation, which of the following processes create high osmotic pressure in the uriniferous tubule?

Number of chromosomes in Down's syndrome are

Which is unrelated