Marriages between close relatives and cousins is not advisable because
Marriages between close relatives and cousins is not advisable because
- A
More mutations can occur
- B
More recessive defects are likely to appear
- C
More chances are there for $Rh$ blood group anomalies
- D
More chances are there for multiple births
Similar Questions
Match the following columns.
Column $- I$
Column $- II$
$(w)$ Blood group
$(a)$ Polygenic inheritance
$(x)$ Skin colour
$(b)$ Aneuploidy
$(y)$ Mendelian disorder
$(c)$ Incomplete dominance
$(z)$ Chromosomal disorder
$(d)$ Sickle-cell anaemia
$(e)$ Co-dominance
Match the following columns.
| Column $- I$ | Column $- II$ |
| $(w)$ Blood group | $(a)$ Polygenic inheritance |
| $(x)$ Skin colour | $(b)$ Aneuploidy |
| $(y)$ Mendelian disorder | $(c)$ Incomplete dominance |
| $(z)$ Chromosomal disorder | $(d)$ Sickle-cell anaemia |
| $(e)$ Co-dominance |
Which of the following pairs is $wrongly$ matched?
Which of the following pairs is $wrongly$ matched?
- [NEET 2018]
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.
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.
- [NEET 2016]
Match the following:
Column $- I$
Column $- II$
$(1)$ Inheritance of two genes
$(a)\; ABO$ blood group
$(2)$ Incomplete dominance
$(b)\; 1:2:1$
$(3)$ Codominance
$(c)\;9:3:3:1$
$(4)$ Inheritance of one gene
$(d)\; 3:1$
Match the following:
| Column $- I$ | Column $- II$ |
| $(1)$ Inheritance of two genes | $(a)\; ABO$ blood group |
| $(2)$ Incomplete dominance | $(b)\; 1:2:1$ |
| $(3)$ Codominance | $(c)\;9:3:3:1$ |
| $(4)$ Inheritance of one gene | $(d)\; 3:1$ |
How many sentence are correct ?
$(i)$ Every gene contains the information to express a particular trait.
$(ii)$ Gene responsible for $\beta$ - thalassemia is present on $21^{st}$ pair of autosomal chromosome.
$(iii)$ Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time.
How many sentence are correct ?
$(i)$ Every gene contains the information to express a particular trait.
$(ii)$ Gene responsible for $\beta$ - thalassemia is present on $21^{st}$ pair of autosomal chromosome.
$(iii)$ Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time.