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4.Principles of Inheritance and Variation
medium
Pick out the correct statements.
$(1)$ Haemophilia is a sexlinked recessive disease.
$(2)$ Down’s syndrome is due to aneuploidy.
$(3)$ Phenylketonuria is an autosomal recessive gene disorder.
$(4)$ Sickle cell anaemia is an $X$-linked recessive gene disorder.
A
$(1), (3)$ and $(4)$ are correct.
B
$(1), (2)$ and $(3)$ are correct.
C
$(1) $ and $(4) $ are correct.
D
$(2)$ and $(4)$ are correct.
(NEET-2016)
Solution
(b): Sicklecell anaemia is an autosomal recessive genetic disorder. It can be transmitted from parents to the offspring when b oth the partners are carriers of the gene (or heterozygous).
Standard 12
Biology
Similar Questions
Match the terms in column $I$ with their description in column $II$ and choose the correct option.
Column $-I$ | Column $-II$ |
$(A)$ Dominance | $(i)$ Many genesgovern a single character |
$(B)$ Codominance | $(ii)$ In a heterozygousorganism only one allele expresses itself |
$(C)$ Pleiotropy | $(iii)$ In a heterozygousorganism both alleles express themselves fully |
$(D)$ Polygenic | $(iv)$ A single gene inheritanceinfluences many characters |