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In human beings,the skin colour is contr...

In human beings,the skin colour is contrilled by :

A

Multiple alleles

B

Polygenic effect

C

Lethal genes

D

None of these

Text Solution

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The correct Answer is:
B
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MBD PUBLICATION-HEREDITY AND VARIATION-QUESTION BANK
  1. A haemophilia man marries a carrier woman. Their children will be :

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  2. Sickle-cell anaemia is an example of :

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  3. In human beings,the skin colour is contrilled by :

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  4. A recessive sex-linked trait in human will be expressed :

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  5. Discontinuous variations are :

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  6. The tern gene which was coined by Johannsen was termed by Mendel as

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  7. Continuous variations are attributed to meiosis through :

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  8. How many possible genotypes are there for the ABO blood group which ar...

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  9. In a dihybrid cross ,F2 ratio of 15 : 1 is due to :

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  10. When two dominant independently assorting genes react with each other ...

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  11. Male XX and female XY sometimes occur due to :

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  12. A disease caused by autosomal primary non-disjunction is :

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  13. Sickle-cell anaemia is

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  14. When an allele of one gene suppresses an allele of another gene,the ph...

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  15. Genes of which inheritable traits are present on the X-chromosome ?

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  16. The genotype of a male individual having sexual character of a female ...

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  17. Human gene determining sex at seventh week of pregnancy called TDF is ...

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  18. Somatic chromosomes are autosomes while sex chromosomes are called

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  19. is a sex -linked trait.

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  20. A cross between hybrid with a double recessive pure plant is called

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