Find the probable gametes to be produced from the hybrid plant YyRr produced at F 1 generation in a dihybrid cross experiment.

A cross between the two pure breeding parents or the homozygous parents in which the pattern of inheritance of two pairs of contrasting characters is observed simultaneously is called a dihybrid cross. In a dihybrid cross, the parents carry different pairs of alleles for each trait. One parent carries a homozygous dominant allele, while the other one carries a homozygous recessive allele. The offsprings produced after the crosses in the F1 generation are all heterozygous for specific traits.

One day students read an article in a newspaper about Thalassemia and were very scared to know the fate of a thalassemia patient. Give a list of the kind of measures they have to use to eradicate this disease from the population.

Thalassaemia is an inherited blood disorder where the body produces an inadequate amount of haemoglobin. Haemoglobin is a protein molecule that has oxygen in the red blood cells. It results in the extreme destruction of red blood cells that leads to anaemia. Anaemia is a condition in which the haemoglobin or red blood cells are less than the regular count. It is an inherited disease that is mainly caused due to abnormal haemoglobin synthesis. It is transferred by one of the parents who are a carrier of this disease due to either deletion of particular key gene fragments or a genetic mutation.

With the help of a cross, determine how the sex of offspring of a human is identified.

In humans, sex is determined by sex chromosomes (XX females, XY males). The X and Y chromosomes harbour dramatically different numbers and sets of genes (about 1 , 000 genes on the X and only a few dozen genes on the Y), yet they originated from ordinary autosomes during the early evolution of mammals. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair, called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. But men have a mismatched pair in which one is a normal-sized X while the other is a short one called Y. So women are XX, while men are XY. All children will inherit an X chromosome from their mother regardless of whether they are boys or girls. Thus, the sex of the children will be determined by what they inherit from their father. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 27

EASY

10th West Bengal Board

IMPORTANT

Earn 100

Mendel used the term gene while describing his experiments related with heredity.

50% studentsanswered this correctly

Important Questions on Heredity and Common Genetic Diseases

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 28

Which law Mendel concluded from his dihybrid cross experiment?

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 29

Give an example of a variation found among healthy persons which is transmitted through generations.

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 30

Show with the help of cross, who is more important among parents in determining the sex of their offspring?

HARD

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 31

‘Different genotypes produce the same phenotype’ – Justify the statement in the form a table by taking an example from the result of dihybrid cross of pea plant?

EASY

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 32

Give your opinion about probable suggestions which can be given to pair of contenders before marriage in order to prevent the spread of a genetic disease from the society already known to you?

MEDIUM

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 33

Tabulate three pairs of dominant-recessive traits of pea plants as selected by Mendel. State the first law of Mendel as deducted from the experiment of a monohybrid cross.

MEDIUM

10th West Bengal Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 16 - Heredity and Common Genetic Diseases>West Bengal Board-2020>Q 34

A colour blind female married a normal male. Judge the probability of colour blindness among their children in the first filial generation. Show with the help of a cross how the first law of Mendel is deviated in the case of Four-O'clock plant in F2 generation.

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