Short Answer TypeThe diagram shown below is the longitudinal section of a testis of man. Study it
carefully and answer the questions that follow:
Draw a neat, labelled diagram of a sperm.
Give biological reasons for the following statements:
Some women have facial hair like heard and moustache.
Give biological reasons for the following statements:
Cutting of trees should be discouraged.
Give biological reasons for the following statements:
In some xerophytes leaves are modified into spines.
Give biological reasons for the following statements:
There is frequent urination in winter than in summer.
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
What is the phenotype and genotype of the F1 generation if a plant bearing
pure axial flowers is crossed with a plant bearing pure terminal flowers?
In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
What is the phenotypic ratio and genotypic ratio of the above cross shown
in (ii)?
Phenotypic ratio for the above cross – 3 : 1 (3 pea plants with axial flowers
: 1 pea plant with terminal flowers)
Genotypic ratio for the above cross – 1 : 2 : 1 (1 homozygous plant with
axial flowers : 2 heterozygous plants with axial flowers : 1 homozygous plant
with terminal flowers)
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
State Mendel’s Law of Dominance.
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