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Question
Give the basic features of the mechanism of inheritance.
Solution
Genes present on the chromosomes control characters or traits. A gene controls a character and has two or more forms and one form may be dominant over the other. An individual has two similar or dissimilar forms of a gene controlling a trait, one inherited from each parent. The two forms of a gene separate during gamete formation so that each gamete has only one form. These two forms of a gene are brought together in the zygote when gametes fuse at the time of fertilisation.
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RELATED QUESTIONS
Appearance of new combinations in F2 generation in a dihybrid cross proves the law of_____________ .
- dominance
- segregation
- independent assortment
- purity of gametes
In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r) : Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).
Predict the genotype and phenotype of the following cross in pea.
TTrr x ttRR
(Capital letters show dominance)
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
Genes which code for a pair of contrasting traits are known as ______.
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be ______.
What does the progeny of a tall plant with round seeds and a short plant with wrinkled seeds look like?
In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.
