STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Select the incorrect pair :

Which of the following is not a Porifera

Which of the following classes has largest number of animals

Study the below given statements and choose the correct statements with respect to linkage and recombination ?
(i) Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked.
(ii) Linkage is the phenomenon, where two or more linked genes are always inherited together and their recombination frequency in a test cross progeny is less than 50%.
(iii) All the genes present on one chromosome form a linkage group and its number in organism is equal to haploid number of chromosomes.
(iv) When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters.
(v) In Drosophila genes for white and yellow were very tightly linked and showed only 1.3 percent recombination.
(vi) In Drosophila genes for white and miniature wing showed 37.2 per cent recombination.

Which one of the following is a synthetic drug

Which one of the following features is found in chordates but not in non-chordates

Taenia and Fasciola are

Glucagon and insulin are

Assertion: Hormone only produced by endocrine glands.
Reason:Hormones are non-nutrient chemicals which produced in large amount.

Assertion : Clitoris is not remnant of penis in females.

Reason : It also has high blood supply and erectile tissue.