8th Class Biology 5th Lesson. We covered all the 8th Class Biology 5th Lesson MCQs in this post for free so that you can practice well for the exam.
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8th Class Biology 5th Lesson Objective for Students
Which one of the following is a hereditary disease?
(a) Cataract
(b) Hemophilia
(c) Pellagra
(d) Osteoporosis
Option b – Hemophilia
Which one of the following genetic diseases is sex-linked?
(a) Royal hemophilia
(b) Tay-Sachs disease
(c) Cystic fibrosis
(d) Hypertension
Option a – Royal hemophilia
A normal woman whose father was colorblind is married to a normal colorblind man. The sons would be
(a) 75% colorblind
(b) 50% colorblind
(c) All normal
(d) All colorblind
Option b – 50% colorblind
Functional genomics deals with the
(a) sequencing of the genome.
(b) study of the functioning of genes and metabolic pathways.
(c) determination of the complete sequence of genomes.
(d) construction of high-resolution genetic and physical maps.
Option b – study of the functioning of genes and metabolic pathways
The phenomenon in which one gene controls two or more different characters simultaneously is called
(a) apomixis
(b) pleiotropy
(c) polyploidy
(d) polyteny
Option b – pleiotropy
Trisomy stands for
(a) 2n-1
(b) 2n+2
(c) 2n+3
(d) 2n+1
Option d – 2n+1
Failure of segregation of chromatids during the cell division cycle results in the gain or loss of a chromosome, which is called
(a) aneuploidy
(b) hypo polyploidy
(c) hyper polyploidy
(d) polyploidy
Option a – aneuploidy
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