Sardar Krushinagar Dantiwada Agricultural Uiversity 2010 B.Sc Agriculture for Competitive : Plant Breeding -university question paper

MULTIPLE option ques.
B.Sc Agriculture (Plant Breeding)
(For Competitive Examination)


Cross pollinated species are also known as____________ species or inbreeders.
A Allogamous B Cleistogamy C Chasmogamy D Autogamous

____________ is a progeny of 2 various single self-pollinated homozygous plants.
A Female parent B Pureline C Inbred D Hybrid

_______________ method of breeding is improper for improvement of good variety.
A Mass Selection B Back cross method C Heterosis breeding D Pure line selection

___________is the newer methods for crop improvement
A Selection B Introduction C Hybridization D Mutagenesis

____________ is a general breeding method
A Hybridization B Mutation C Distant hybridization D Introduction

_____________ pollinated crops have heterozygous balance and are not tolerant to inbreeding.
A Self B Cross C Often cross D Non of all

Mendel theorized that genetic traits are "segregated" during gamete formation and the offspring get only 1 gene for a trait from every parent. Why is this important to sexually reproducing organisms?
A They would get too many dominant traits if it did not occur B They would get too many recessive traits if it did not occur C It allows for offspring to be various from their parents D It allows the best traits to be opted out for the offspring

Mendel theorized that genetic traits are "independently assorted" and 1 trait does
not depend on a different for transmission to offspring. What do we know today that
makes this theory invalid?
A Genes on the identical chromosome are usually transmitted together. B Chromosomes stick together and are often transmitted with every other. C The identical gene may be responsible for several various traits. D Transmission of genes is random and depends on laws of probability

Where are genes for sex-linked traits located?
A They can be on any chromosome B On the "Y" chromosome C On the "X" chromosome D On chromosome pair # 21

A white flower crossed with a red flower produces pink offspring. This is an example of incomplete dominance. If 2 of the pink-flowered plants are crossed, what ratio will the genotypes of the offspring have?
A 1 RR: three Rr B 1 RR: two RR': one R'R' C 2 Rw: two Ww D 1 Rr: two rr: one ww

Why blood kinds are considered an example of codominance?
A there are 4 kinds of blood, not two B blood kind O can be donated to anyone, AB cannot C blood kinds A and B will both be expressed when present D there are 3 alleles for blood kind and 4 kinds of blood

How many pairs of homologous chromosomes do humans have?
A 4 B 23 C 44 D 46

If 2 various alleles are present, which allele is expressed?
A recessive B dominant C phenotypic D pure

A tall pea plant (DD) and a tall pea plant (Dd) have what in common?
A phenotype B genotype C alleles D seed color

In crossing homozygous dominant and homozygous recessive pea plants, Mendel
noted that a few genes were not seen in the F1 generation and were seen in only 25%
of the F2 generation. What did he call these genes?
A dominant B recessive C lethal D incompletely dominant

Continuous inbreeding (Selfing) leads
A Homozygosity B Hetrozygosity C Both D None

Composite varieties are developed in crops
A Selfpollinated B Cross pollinated C Clone D All of these

Broader genetic base is obtained in
A Mass selaction B Pureline selection C Clonal selection D All of these

Effective selection can be made in
A Pureline B Hybrid C Clone D Multilines

Heterosis outcomes due to complementation ranging from
A Different genes B Divergent alleles C Multiple alleles D Iso - alleles

Earning:   Approval pending.