17990.Which one of the followings is assigned an uppercase letter?
Superior allele
Dominant allele
Inferior allele
Mutant allele
17991.Test cross is a cross between
Hybrid × Hybrid parent
Hybrid × Recessive parent
Hybrid × Dominant parent
Two distantly related species
17992.A man and a women, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease?
Sex-linked recessive
Autosomal dominant
Sex-limited recessive
Sex-linked dominant
17993.If a colour-blind woman marries a normal visioned man, their sons will be
Three-fourths colour-blind and one-fourth normal
One-half colour-blind and one-half normal
All normal visioned
All colour-blind
17994.Select the correct statement from the ones given below with respect to dihybrid cross
Tightly linked genes on the same chromosome show higher recombinations
Genes far apart on the same chromosome show very few recombinations
Tightly linked genes on the same chromosome show very few recombinations
Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones
17996.How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
Three
Four
Nine
Two
17998.A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCc, the phenotypic ratio of the offsprings was observed as 1 : 6 : x : 20 : x : 6 : 1. What is the possible value of x?
3
9
15
25
18000.Which of the following pairs is correctly matched?
Sickle cell anemia - X chromosome
Down's syndrome - 21st chromosome
Haemophilia - Y chromosome
Parkinson's disease - X and Y chromosome
18001.In Drosophila, the sex is determined by:
The ratio of pairs of X-chromosomes to the pairs of autosomes
X and Y chromosomes
The ratio of number of X-chromosomes to the sets of autosomes
Whether the egg is fertilized or develops parthenogenetically
18002.Which one of the followings is not correct for Huntington disease ________?
Caused by a dominant allele
Marked by progressive nerve degeneration
Causes tumors and affects the liver as well
Affects the brain leading to mental disability and death
18003.Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
Factors occur in pairs
The discrete unit controlling a particular character is called a factor
Out of one pair of factors one is dominant, and the other recessive
Alleles do not show any blending and both the characters recover as such in F2 generation
18004.Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?
Color blindness – Y-linked
Klinefelter's syndrome – 44 autosomes + XXY
Down syndrome – 44 autosomes + XO
Erythroblastosis fetalis – X-linked
18005.The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed
Transformation
Translocation
Crossing over
Chromosomal aberration
18006.Lysosomes and ribosomes
Lysosomes and ribosomes
Ribosomes and chloroplast
Endoplasmic reticulum and mitochondria
Mitochondria and chloroplasts
18007.What is the pattern of inheritance called in which phenotype is influenced by many genes?
Polygenic inheritance
Epistasis
Monohybrid cross
Dihybrid cross
18008.Test cross of dihybrid ratio 1 : 1 : 1 : 1 then it proves that
F1 hybrid produces four different progenies
F1 hybrid produces two different progenies
F1 hybrid is homozygous
Four different progenies are produced by parents
18009.Select the incorrect statement from the following?
Baldness is a sex-limited trait
Linkage is an exception to the principle of independent assortment in heredity
Galactosemia is an inborn error of metabolism
Small population size results in random genetic drift in a population