大学MOOC Forage Breeding(Northwest A&F University)1458245167 最新慕课完整章节测试答案
11.Distant hybrids breeding
文章目录
Qize3
1、单选题：
Simple recurrent selection is suitable for ( ), selecting populations with good characters by phenotype.
选项：
A: high heritability
B: low heritability
C: polygenic control
D: high combining ability
答案: 【 high heritability】
2、单选题：
The tests that can measure both general and special combining ability are
选项：
A: diallel cross
B: multiple cross
C: top crossing
D: multi-parent complex crosses
答案: 【 diallel cross】
3、单选题：
In the process of synthetic cultivars breeding, the most commonly used methods for improving the initial population are:
选项：
A: mass recurrent selection
B: simple recurrent selection
C: recurrent selection of general combining ability
D: recurrent selection of special combining ability
答案: 【 mass recurrent selection】
4、单选题：
Backcross breeding is mainly used for improvement of
选项：
A: quality trait
B: quantitative trait
C: both quality and quantity traits are OK
D: neither quality nor quantity
答案: 【 quality trait】
5、单选题：
The complementary traits of hybrid parents should pay attention to:
选项：
A: Main traits
B: Quality traits
C: Quantitative traits
D: Yield traits
答案: 【 Main traits】
6、单选题：
One of the hybrid parents should be:
选项：
A: Major cultivars
B: High yield cultivars
C: High resistant cultivars
D: Wild species
答案: 【 Major cultivars】
7、单选题：
Self-pollinating plants can use heterosis as follows:
选项：
A: Crossing among the cultivars
B: Must by selecting on inbred lines
C: Backcross required
D: It needs to be fixed by asexual propagation
答案: 【 Crossing among the cultivars】
8、单选题：
The self-cross rate of high sterile male sterile plants was as follows:
选项：
A: 0.1%-10%
B: 0
C: 11%-50%
D: 51%-80%
答案: 【 0.1%-10%】
9、单选题：
By using " Three-line hybrid" for seed production which needs ( ) isolation zone:
选项：
A: 2
B: 1
C: 3
D: 4
答案: 【 2】
10、多选题：
The general procedures of synthetic cultivars breeding include:
选项：
A: Initial population improvement
B: Parental genotype homozygosity
C: Combining ability test
D: Initial hybridization
E: Reproduction of synthetic cultivar populations
答案: 【 Initial population improvement;
Parental genotype homozygosity;
Combining ability test;
Initial hybridization;
Reproduction of synthetic cultivar populations】
11、多选题：
The factors affecting the stability of synthetic cultivars include:
选项：
A: parent heritage basis
B: cultivar synthetic mode
C: reproduction system of cultivars
D: isolation in production
答案: 【 parent heritage basis;
cultivar synthetic mode;
reproduction system of cultivars;
isolation in production】
12、多选题：
The characteristics of recurrent selection are as follows:
选项：
A: fine gene accumulation
B: breaking bad gene linkage
C: maintain a large degree of genetic variation
D: match the needs of different periods of breeding
答案: 【 fine gene accumulation;
breaking bad gene linkage;
maintain a large degree of genetic variation;
match the needs of different periods of breeding】
13、多选题：
The following which are multiple cross combinations:
选项：
A: Triple crossesing
B: Double crossing
C: Pairwise crossing
D: Back crossing
答案: 【 Triple crossesing;
Double crossing】
14、多选题：
Attention should be paid to the selection of hybrid parents
选项：
A: Complementary advantages and disadvantages of parents
B: One of the parents is the main variety
C: The genetic difference of parents is great
D: High special combining ability of parents
答案: 【 Complementary advantages and disadvantages of parents;
One of the parents is the main variety;
The genetic difference of parents is great】
15、多选题：
In order to ensure that the hybrid parents meet at flowering, the following measures are taken:
选项：
A: Adjust sowing time
B: Adjust illumination
C: Adjust temperature
D: To cut or remove the main stem
答案: 【 Adjust sowing time;
Adjust illumination;
Adjust temperature;
To cut or remove the main stem】
16、多选题：
The methods of accelerating hybrid breeding of forage are as follows:
选项：
A: Using greenhouse for additive generation
B: Early generation yield measurement
C: Overstepping and promotion
D: Using asexual propagation to increase seed yield
答案: 【 Using greenhouse for additive generation;
Early generation yield measurement;
Overstepping and promotion;
Using asexual propagation to increase seed yield】
17、多选题：
Male sterility has the following characteristics:
选项：
A: Stamen deformity
B: Stigma higher than stamen
C: Anther absent or uncracked
D: Complete absence of pollen
答案: 【 Stamen deformity;
Stigma higher than stamen;
Anther absent or uncracked】
18、多选题：
Heterosis can be measured in the following ways:
选项：
A: Mid-parent heterosis
B: Transgressive heterosis
C: Superstandard heterosis
D: Heterosis index
答案: 【 Mid-parent heterosis;
Transgressive heterosis;
Superstandard heterosis;
Heterosis index】
19、多选题：
Heterosis is better than （）of parents.
选项：
A: Viability
B: Growth vigor
C: Resistance
D: Yield and quality
答案: 【 Viability;
Growth vigor;
Resistance;
Yield and quality】
20、判断题：
With the increase of reproductive generation, the vitality of self-fertility forage will gradually tend to be balanced and stable.
选项：
A: 正确
B: 错误
答案: 【 正确】
21、判断题：
The reproductive generations of synthetic cultivars are limited, generally 3-6 generations.
选项：
A: 正确
B: 错误
答案: 【 错误】
22、判断题：
The parents of synthetic cultivars should be determined according to their performance of yield traits and their hybrid effects.
选项：
A: 正确
B: 错误
答案: 【 正确】
23、判断题：
The recurrent selection of general combining ability can use cultivars as tester.
选项：
A: 正确
B: 错误
答案: 【 正确】
24、判断题：
No other alfalfa cultivars can be sown in the range of 300-500 meters when alfalfa is cross pollinated.
选项：
A: 正确
B: 错误
答案: 【 错误】
25、判断题：
The original material nursery can be used as the parent nursery for the first generation of hybridization.
选项：
A: 正确
B: 错误
答案: 【 正确】
26、判断题：
More than two years of cultivar comparison test, and another one year of regional test can enter the stage of cultivar approval.
选项：
A: 正确
B: 错误
答案: 【 错误】
27、判断题：
The selection of restorer lines is mainly based on cross test.
选项：
A: 正确
B: 错误
答案: 【 正确】
28、判断题：
The restorer lines can be omitted in two-line hybridization.
选项：
A: 正确
B: 错误
答案: 【 错误】
29、判断题：
Forage plants with n (rfrf) genotype with nuclear-cytoplasmic interaction can be used as male sterile lines.
选项：
A: 正确
B: 错误
答案: 【 错误】
30、判断题：
Under the condition of complete pollination, a ratio of 6:2 could be used to increase the hybrid seed yield.
选项：
A: 正确
B: 错误
答案: 【 正确】
31、填空题：
The synthetic cultivars are come from which are hybridized, mixed or planted by inbred lines or clones.
答案: 【 2】
32、填空题：
Cultivating synthetic cultivars is an effective method for plants improve and breed.
答案: 【 cross pollination plants】
33、填空题：
In the recurrent selection, multiple continuous reincarnation is a process that .
答案: 【 favorable gene accumulation】
34、填空题：
Interactive recurrent selection is a special application of recurrent selection on .
答案: 【 half sib strains】
35、填空题：
Cross breeding is a new breed which is produced by crossing, selecting and breeding between individuals with .
答案: 【 different heritability】
36、填空题：
The cross between two parents is called .
答案: 【 single crossing】
37、填空题：
Backcross breeding is often used to improve that one or two shortcomings of .
答案: 【 popularizing fine varieties】
38、填空题：
Heterosis is the comprehensive performance of .
答案: 【 multiple traits】
39、填空题：
The size of heterosis is directly related to .
答案: 【 homozygosity of parents】
40、填空题：
The asexual propagation plants obtain the heterosis by ，and fixed it by asexual propagation.
答案: 【 sexual reproduction】
15.Forage maize breeding
Qize 4
1、单选题：
It is difficult to distinguish the physiological races in morphology, usually relying on ( ) to distinguish them.
选项：
A: differential hosts
B: phenotype
C: genotype
D: pathogenicity
答案: 【 differential hosts】
2、单选题：
By reducing the reproduction coefficient of the initial source, in order to reduce the loss caused by disease, the way of plant disease resistance is
选项：
A: anti-invasion type
B: anaphylactic necrotic type
C: anti-expansion type
D: corking type
答案: 【 anti-invasion type】
3、单选题：
In the diseases caused by facultative parasites, the inheritance of resistance is mainly ( ).
选项：
A: polygenes
B: major gene
C: multiple allele
D: single gene