Choose correct answer :
$(i)$ Queen Elizabeth shows a number of haemophilic descendents.
$(ii)$ Variation in blood group prevalences due to incomplete dominance.
$(iii)$ Drosophila has three pairs of autosomal chromosomes.
$(iv)$ In birds, female is heterozygous.
$FFTT$
$TFFT$
$TTFF$
$TFTT$
Select the correct statement:
Match the Column - $I$ with $II$
Column - $I$ | Column - $II$ |
$(a)$ Pleiotropic gene | $(i)$ Both allele express equally |
$(b)$ Co-dominance | $(ii)$ Change in nucleotide |
$(c)$ Epistasis | $(iii)$ One gene shows multiple phenotypic expression |
$(d)$ Mutation | $(iv)$ Rust disease |
What is the correct sequence of the following events
$1.$Formation of the chromosome theory of heredity
$2.$Experiments which proved that $DNA$ is the hereditary material
$3.$Mendel's laws of inheritance-discovery
Code :
Select incorrect statement
$(A)$ Linked genes cause absolute lethality
$(B)$ Persons affected by $PKU$ do not show mental disorder
$(C)$ $F_{2}$ ratio in codominance and incomplete dominance are same
$(D)$ Sex of male Drosophila is dependent on $Y-$chromosome
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.