تمارين أونلاين Biology | complementary and lethal genes
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سؤال 1 of 11
1. سؤال
Which of the following statements is true of complementary genes?
- A – Complementary genes are genes in which two genes or more contribute to the expression of one characteristic or trait.
- B – Complementary genes are genes in which one gene produces a characteristic and the second is only able to supplement this characteristic.
- C – Complementary genes are genes in which neither allele is recessive and the phenotypes of both alleles are expressed.
- D – Complementary genes are genes in which one gene is dominant and the second is recessive.
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سؤال 2 of 11
2. سؤال
Flower color in sweet pea plants is an example of a characteristic affected by complementary gene action. The flowers can be white or purple; in this scenario, there must be a dominant allele present for both genes for the purple flower color to be shown.
Which of the following genotypes would give a plant with white flowers?
A – AaBb
B – AaBB
C – aabb
D – AaBb
E – AABb
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سؤال 3 of 11
3. سؤال
the dominant lethal genes differs from the recessive lethal genes in all the following except…..
a-the genotype of the dead offspring
b-the genotype of living offspring
c-the phenotype percentage of living offspring
d-the percentage of the dead offspring
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سؤال 4 of 11
4. سؤال
the percentage of the lost mice when crossing a yellow colored male with a grey colored female is……….
a- 50% b- 33% c-25% d-0%
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سؤال 5 of 11
5. سؤال
when a crossing occurs between yellow mice male and female after multiple births 18 yellow mice and 9 grey mice were produced so, it is expected that the number of dead mice in the uterus is…….
a- 18 b-9 c-3 d-0
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سؤال 6 of 11
6. سؤال
the environmental factors can effect…………
a-the phenotype only
b-the genotype only
c-both phenotype and genotype
d- the phenotype and genotype separately
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سؤال 7 of 11
7. سؤال
which of the following crossing produce half the offspring carrying the dominant in pea plant?
a-AAbb x aaBb b-AAbb x aaBB
c-Aabb x aaBB d-aaBB x aabb
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سؤال 8 of 11
8. سؤال
when planting some wheat seeds all the seedlings were yellow colored due to all the following except..
a-the seed genotype is (Cc) + light absence
b-the seed genotype is (cc) + light presence
c-the seed genotype is (cc) + light absence
d-the seed genotype is (Cc) + light presence
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سؤال 9 of 11
9. سؤال
the individual whose genotype AbBb gives a number of gametes , some of them carry one dominant gene their percentage=..
a-100% b-75% c-50% d- 25%
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سؤال 10 of 11
10. سؤال
the opposite table shows the genotypes for the fur color in mice when crossing the mouse no (1) with no (2), it is expected that the percentage of loss in the result offspring is…….
a- 0% b- 25% C- 50% 75%
Mouse No (1) No (2) genotype Yy yy صحيحغير صحيح -
سؤال 11 of 11
11. سؤال
the case in which the production of individual carrying the dominant character may occur , when crossing individuals carrying recessive character take place, is the case of……….
a-sex- linked genes b- complete dominance
c-complementary genes d-lack of dominance
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