RR (red) is crossed with rr (white). All the Rr offsprings are pink. This is an indication that R gene is:
Hybrid
Recessive
Incompletely dominant
Mutant
Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue eyed women. The children shall be
Both blue eyed and brown eyed 1 : 1
All brown eyed
All blue eyed
Blue eyed and brown eyed 3 : 1
A family of five daughters only is expecting sixth issue. The chance of its being a son is
Zero
25%
50%
100%
Which contribute to the success of Mendel?
Qualitative analysis of data
Observation of distinct inherited traits
His knowledge of biology
Consideration of one character at one time
Two homologous genes are exactly similar in genotype called:
Heterozygous
Hemizygous
Homozygous
None of these
Triticale has been evolved by intergeneric hybridization between
Wheat and rye
Wheat and rice
Rice and maize
Wheat and aegilops
In Down's syndrome of a male child, the sex complement is
XO
XY
XX
XXY
Which one is a hereditary disease?
Cataract
Leprosy
Blindness
Phenylketonuria