Last seen: Dec 29, 2021
In humans, there are 23 pairs of chromosomes. 22 pairs of these chromosomes do not take part in sex determination called autosomes. The 23rd pair dete...
A record of inheritance of certain genetic traits for two or more generations presented in the form of a diagram of family tree is called pedigree. Pe...
(i) TH Morgan is a Geneticist who got Nobel Prize. (ii) He found fruit fly (Drosophila Melanogaster) to be an experimental material as it was easy ...
Two heterozygous parents (i.e. GgLl and GgLl) are crossed and the two loci are linked then the cross will be figure.png This means, if ‘G’ repres...
figure.png Phenotypes of the offsprings: Tall Yellow : 3 Tall Green : 3 Dwarf Green: 1 Dwarf Yellow: 1 (a) Proportion of tall and gr...
When a heterozygous male tall plant (Tt) is crossed with the homozygous dominant female tall plant (TT), we get two types of gametes in males: half wi...
The crossing of F1 individuals having dominant phenotype with its homozygous recessive parent is called test cross. The test cross is used to determin...
The Law of dominance states that when a pair of alleles or allelomorphs are brought together in F1 hybrid, then only one of them expresses itself, mas...
A diploid organism heterozygous for 4 loci will have the supported genetic constitution YyRr for two characters. The alleles Y-y and R-r will be prese...
Monohybrid: (i) It is a cross between two pure organisms in order to study the inheritance of a single pair of alleles. (ii) It produces a phenoty...
Homozygous: (i) It is pure for a trait and breeds true i.e., gives rise to similar homozygous individuals. (ii) Both the alleles of a trait are si...
Dominant: (i) Dominant allele is able to express itself even in the presence of its recessive allele. (ii) It does not require another similar all...
1. The plant shows clear-cut contrasting characters. 2. Hybrids are perfectly fertile. 3. Genes for the seven contrasting characters are located...
Correct answer: (a) Treponema pallidum
Correct answer: (c) gonorrhoea
Correct answer: (a) Syphilis-Treponema pallidum
Correct answer: (d) None of these.
Correct answer: (c) It prevents the movement of sperm into the urethra.
Correct answer: (d) Sterilisation
Correct answer: (d) IUDs (Intra uterine devices)