Mendel crossed plants bearing red flowers (RR) with the plants bearing white flowers (rr) and produced progeny from them. The plants with red flowers obtained in F 1 generation were different from the plants with red flowers of the parental generation. Why? Explain with reasons.

Mendel performed crosses, which involved mating two true-breeding individuals that have different traits. A genetic trait is considered dominant if it is expressed in a person who has only one copy of that gene. A recessive trait is a trait that is expressed when an organism has two recessive alleles. In parent generation, plant bearing red flowers has both the dominant traits RR. In parent generation, plant bearing white flowers has both the recessive traits rr. F1 generation plant inherits one copy of dominant trait (red) and one copy of recessive trait (white) from the parental plants Rr. But only the dominant trait (red) is expressed.

Heredity is the study of the transmission of genes from parents to offspring and the laws governing such a transmission. Along with genetic characters, variations also appear during the transmission. Branch of biology that deals with the study of heredity and variations are called genetics.

Phenotype is defined as the external appearance of an individual for any trait. It is observable and is determined by different combinations of alleles. For example, in the pea plant, the coloured flower represented by the genotype CC and Cc and the white flower represented by the genotype cc are the two phenotypes.

Observe the illustration. Which character is expressed in first generation ? Why ?

The dominant trait of any character is controlled by the dominant allele. When a dominant allele is present no recessive allele can show its effect. That’s why only the dominant trait is observed. In the given illustration R is the dominant allele and r is the recessive allele. In the first generation, there will be red flowers as the dominant character will be expressed in the first generation. This allele controls the phenotype of the organism.

EASY

Earn 100

Define parent generation.

Important Questions on Heredity and Evolution

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

Write down the differences between the dominant gene and the recessive gene.

EASY

Science>Biology>Heredity and Evolution>Heredity

Give any two traits studied by Mendel.

EASY

Science>Biology>Heredity and Evolution>Heredity

Define the term ‘recessive’.

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

The continuity of features from one generation to another is known as

HARD

Science>Biology>Heredity and Evolution>Heredity

What is the law of dominance of traits? Explain with an example.

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

Mendel crossed plants bearing red flowers (RR) with the plants bearing white flowers (rr) and produced progeny from them. The plants with red flowers obtained in F₁ generation were different from the plants with red flowers of the parental generation. Why? Explain with reasons.

EASY

Science>Biology>Heredity and Evolution>Heredity

What is a dominant character?

EASY

Science>Biology>Heredity and Evolution>Heredity

Define the heredity.

EASY

Science>Biology>Heredity and Evolution>Heredity

Define phenotype.

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

Assess how many types of gametes are produced from the Pea plant having the genotype RRYY

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

What are Genetics? Explain Mendel law of dominance with line diagram.

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

‘‘The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it.’’ Justify this statement with the help of a flow chart showing sex-determination in human beings.

EASY

Science>Biology>Heredity and Evolution>Heredity

Identify the word pair relation and fill the blanks,

Arrangement of nucleotides: DNA profiling
Identifying, the location of a gene in DNA: _____ .

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

How are acquired traits different from inherited traits? (Give any two points.)

EASY

Science>Biology>Heredity and Evolution>Heredity

The inheritance or transmission of characters from one generation to another is called

HARD

Science>Biology>Heredity and Evolution>Heredity

What is the relation of Genetics with Human Welfare?

EASY

Science>Biology>Heredity and Evolution>Heredity

Observe the illustration.

Question Image

Which character is expressed in first generation ? Why ?

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

What are dominant and recessive characters? Explain with example.

EASY

Science>Biology>Heredity and Evolution>Heredity

Why are the traits acquired during the lifetime of an individual not inherited? Explain?

MEDIUM

Science>Biology>Heredity and Evolution>Heredity

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?

Define parent generation.

Important Questions on Heredity and Evolution

Learn and Prepare for any exam you want !