MEDIUM
10th CBSE
IMPORTANT
Earn 100

Pea plants can have green or yellow seeds. One of the phenotypes shows dominance over the other. A farmer decides to pollinate a flower of a plant with green seeds using pollen from a flower of a plant with yellow seeds. The resulting pod has all green seeds.
What should be the genotype of the parent plants to give green and yellow seeds in equal proportions?

Important Questions on Heredity

MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 10
The farmer crosses two heterozygous green seeded plants and obtains 100 plants in the F1 generation. What would be the number of green and yellow seeds respectively in the F1 generation?
MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 11
Sex determination in humans happens through sex chromosomes. Along with other parameters, such processes often help in forensic studies in crime investigation and / or identification of accidents and natural calamities. In order to determine whether an accident victim is male or female, which cells can be used and why?
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 12
When 500 plants are produced in the F2 generation of monohybrid cross, the number of homozygous recessive plants obtained is
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 13
Which of the following statement is incorrect?
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 14
The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds.
Dominant trait Recessive trait Number of F2 offspring
Round seeds Wrinkled seeds 7524
From these results, it can be concluded that the actual number of round seeds he obtained was
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 15
Usually, the recessive character is expressed only when present in a double recessive condition. However, a single recessive gene can express itself in human beings when the gene is present on:
HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 16

Seema learned the chapter heredity and evolution in her school. She was so interested in the topic that she crossed pure breed pea plants having round-yellow seeds with wrinkled green seeds to see what happens. Seema found that only A-B type of seeds was produced in the F1 generation. Later when she crossed F1 generation pea plants having A-B type of seeds by self-pollination, then in addition to the original round yellow and wrinkled green seeds, two new varieties A-D and C-B types of seeds were also obtained.

Which one of these will be produced in maximum number in the F2 generation?

HARD
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 9 - Heredity>Exercise>Q 17
Two pea plants heterozygous for round seeds and tall stem were crossed. Out of 720 offspring obtained from this cross, how many offspring would have round seeds and tall stem?