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.

Answer the following: What will be the ratio in F 2 generation in Mendel's dihybrid cross?

A dihybrid cross is a cross between two individuals that are both heterozygous for two different traits. As an example, let's look at pea plants and say the two different traits we're examining are colour and shape of seeds. Mendel observed that the F2 progeny of his dihybrid cross had a 9:3:3:1 ratio and produced nine plants with round, yellow seeds, three plants with round, green seeds, three plants with wrinkled, yellow seeds and one plant with wrinkled, green seeds.

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Define Dihybrid Cross.

Important Questions on Heredity and Evolution

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A homozygous tall pea plant is crossed with its homozygous recessive parent. Find out the genotypic and phenotypic ratio with the help of Punnet square method.

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A cross wạs carried out between two individuals, heterozygous for two pairs of genes. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be

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Identify which one of the following is a test cross.

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How is the sex of the child determined in human beings?

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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the

F_{1}

plants were selfed the resulting genotypes were in the ratio

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

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How will you find that F1 Hybrid is homozygous or heterozygous? Explain it with suitable example.

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Answer the following:

Why do all gametes formed in females have only X chromosomes?

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A round seeded tall pea plant is crossed with round seeded dwarf plant and obtained progeny are with following phenotypes
$3$ - Tall, Round
$3$ - Dwarf, Round
$1$ - Tall, Wrinkled
$1$ - Dwarf, Wrinkled

The possible genotype of parents:

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Some of

F_{2}

progeny are formed during dihybrid cross between round and yellow

(\overset{↑}{o})

and wrinkled and green

(\overset{\circ}{+})

pea plants. Their genotypes are:

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Define the heredity.

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In human beings, brown eye (B) is dominant over blue eye (b). A brown-eyed couple has a blue-eyed child. What are the possible genotypes of the couple?

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Answer the following:

What will be the ratio in F₂ generation in Mendel's dihybrid cross?

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How is the sex of child determined in human beings?

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Select the correct alternative from those given below each statement and write the completed statement:

In Mendel’s breeding crosses, F₂ generation was produced through _____.

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Gauri hurts her hand in an accident and two fingers had to be cut off. Her child is born with all the fingers on his hand. What conclusion can you draw from this?

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Answer the following:

Name:

The sex chromosome boys inherit from their father.

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The maximum number of different gametes of the pollens produced by a tall pea plant with round, yellow, seeds of the genotype

TtRrYY

, if the three loci are unlinked, would be

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What is the possible genotypic ratio in

F_{2}

generation if a plant producing red flowers

(RR)

is crossed with another plant of the same species that produces white flowers

(rr) ?

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Who is known as the father of Genetics?

Define Dihybrid Cross.

Important Questions on Heredity and Evolution

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