Mendel took garden pea plants with different characteristics, such as height to study the inheritance…
Mendel took garden pea plants with different characteristics, such as height to study the inheritance pattern of factors (genes). He crossed tall pea plant with short pea plant and obtained all the tall plants in the F1 generation.
Answer the following questions :
(a) Why only tall pea plants were observed in F1 progeny ? [1]
(b) By which method did Mendel obtain F2 progeny ? [1]
(c) (i) Write one difference between dominant and recessive trait. [2]
Solution
(a) In F1 progeny, pea plants have ‘Tt’ where ‘T’ is dominant over ‘t’
so all the plants of F1 progeny were tall. / Tall height is dominant
trait over short height.
(b) Self-pollination
(c) (i)
Dominant trait Recessive trait
i) Expresses itself over i) Unable to express itself in
recessive trait. presence of a dominant trait.
ii) Expresses in both ii) Expresses itself only when it
conditions-TT and Tt. is ‘tt’ or in pure condition.
(any one, any other suitable difference)
OR
(c) (ii) Mendel’s observations:
• All plants of F1 progeny were tall.
• No medium/ no short height plants observed in F1
progeny.
1+1
• F1 progeny resembled one parent only.
(any two observations)