Biology Chapter 13 Entry test MCQs
Topic 13
Basic Terms
1. The alleles are:
a. Multiple forms of genes
b. A pair of genes goveming a specific chamcter
c. Genes present on Allosomes
d. Genes governing eye characters
2. An organism’s genetic constitution is called its:
a. Phenotype
b. Genotype
c. Gene pool
d. Genetics
3. All the genes/alleles found in a breeding population at a given time are collectivels termed as:
a. Genotype
b. Genome
c. Karyotype
d. Gene pool
4. An allele is said to be dominant if:
a. It is expressed in both homozygous and heterozygous condition
b. It is expressed only in heterozygous combination
c. It is expressed only in second generation
d. It is expressed only in homozygous combination
5. An organism with two identical alleles for a given trait is:
a. Heterozygous
b. Homozygous
c. Hermaphrodite
d. Dominant
6. Position of a gene within a DNA molecule is:
a. Origin
b. Locus
c. Filial
d. Amplicon
7. The total number of genes in a population is called:
a. Allele pool
b. Gene pool
c. Genomic library
d. Genome
8. Locus stands for:
a. Position of an allele within a DNA molecule
b. Position of gene on homologous chromosomes
c. Close regions of same chromosomes
d. Regions of chromosomes
9. The region of the chromosome or more specifically, a length of the DNA molecule, which has a particular nucleotides sequence that codes for specific protein, is called———.
a. Gene
b. Locus
c. Kinetochore
d. Allele
10. ————is the exact position of a gene on the chromosome.
a. Locus
b. Genotype
c. Trait
d. Centromere
11. Homozygous means:
a. Having two identical genes
b. Having two identical alleles of a gene
c. Two different alleles of a gene
d. Alleles in an organism
12. In genetics, the term locus refers to the————-of the gene on the chromosome.
a. Copy
b. Frequency
c. Inversion
d. Position
13. When both the alleles of a gene pair are same, the organism is said to be:
a. Genotype
b. Heterozygous
c. Phenotype
d. Homozygous
14. Phenotype is:
a. The form of appearance of a trait
b. The genetic complement i.e. the genes in an individual for a particular trait
c. The position of a gene on the chromosome
d. Partner of gene pair
Mendelian Inheritance
15. In Mendel’s experiment, nature of seed coat, flower colour, position of flower, pod colour, stem height, etc., are referred as:
a. Genotypes
b. Alleles
c. Karyotype
d. Phenotypes
16. Mendel concluded that each organism has two hereditary factors for each trait, now called:
a. Chromosomes
b. Chromatids
c. None of the above
d. Alleles
17. How many pairs of homologous chromosomes are present in Pisum sativum?
a. Nine pairs
b. Seven pairs
c. Ten pairs
d. Eight pairs
Law of Segregation/Inheritance of Single Trait
18. The dwarfness in plants of F2 generation is due to:
a. Heterozygous dominant alleles
b. Homozygous recessive alleles
c. Heterozygous recessive alleles
d. Homozygous dominant alleles
19. In Mendel’s experiments, the phenotypic ratio of recessive to dominant plants was equal to:
a. 3:1
b. 1:3
c. 9:3
d. 3:9
20. A cross between a homozygous recessive and a heterozygous plant is called:
a. Dihybrid cross
b. Monohybrid cross
c. Back cross
d. Test cross
21. Self-cross between Tt and Tt plants results into the genotype ratio of:
a. 1:2:1
b. 3:1
c. 4:0
d. 1:3
22. Self-fertilization of F1 dihybrids, following independent assortment of alleles will result in:
a. 9/16 tall, wrinkled: 3/16 dwarf, round
b. 3/16 tall, round: 3/16 dwarf, wrinkled
c. 3/16 tall, wrinkled: 3/16 dwarf, round
d. 9/16 tall, round: 1/16 dwarf, round
Law of Independent Assortment/Inheritance of Two Traits
23. In Mendelism, the linkage was not observed due to:
a. Independent assortment
b. Mutation
c. Crossing over
d. Synapsis
24. A cross between plants having RRYY and rryy composition will yield plants with:
a. Round and green seeds
b. Round and yellow seeds
c. Wrinkled and green seeds
d. Wrinkled and yellow seeds
25. When a tall plant with rounded seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), then the generation consists of tall plants with rounded seeds. How many types of gametes a plant would produce?
a. Three
b. One
c. Eight
d. Four