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Recent questions tagged class 12

A dihybrid heterozygous round, yellow seeded garden pea was crossed with a double recessive plant. <br> i. What type of cross is this ? <br> ii. Work out the genotype and phenotype of the progeny. <br> iii. What principle of Mendel is illustrated by it ?

asked Apr 24, 2019 by priyanka.clay6

1 answer

What will be the genotype and phenotype of the offspring if a colour blind man marries a carrier woman?

asked Apr 24, 2019 by priyanka.clay6

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Give the characteristic features of Turner’s Syndrome.

asked Apr 24, 2019 by priyanka.clay6

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Tabulate the different types of *** determination in organisms.

asked Apr 24, 2019 by priyanka.clay6

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How does the Mendelian disorder phenylketonuria occur?

asked Apr 24, 2019 by priyanka.clay6

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Explain the mechanism of *** determination in honeybees.

asked Apr 24, 2019 by priyanka.clay6

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Enumerate points to establish parallelism between chromosomes and genes.

asked Apr 24, 2019 by priyanka.clay6

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A man with AB blood group marries a woman with AB blood group. <br> i. Work out all possible genotypes and phenotypes of the progeny. <br> ii. Discuss the kind of domination in the Parents and progeny.

asked Apr 24, 2019 by priyanka.clay6

1 answer

Which phenomenon is associated with this ?

asked Apr 24, 2019 by priyanka.clay6

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In a hybrid cross the following recombination frequencies are observed, i.e. 10%, 22% and 6% of recombinants. <br> <br> i. How is this recombinant percentage related to the loci of the gene responsible for recombinants.

asked Apr 24, 2019 by priyanka.clay6

1 answer

A man with blood group A married a woman with B group, they have a son with AB blood group and a daughter with blood group O, work out the possibility of inheritance with the help of a Punnet square.

asked Apr 23, 2019 by priyanka.clay6

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With the help of an example differentiate between incomplete dominance and co- dominance.

asked Apr 23, 2019 by priyanka.clay6

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Explain law of dominance with an example.

asked Apr 23, 2019 by priyanka.clay6

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Define and explain test cross.

asked Apr 23, 2019 by priyanka.clay6

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The male fruit fly and female fowl are heterogametic, while the female fruit fly and the Male fowl are homogametic. Why are they termed so?

asked Apr 23, 2019 by priyanka.clay6

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What is pedigree analysis, how is it useful?

asked Apr 23, 2019 by priyanka.clay6

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A homozygous green seeded plant is crossed with yellow seeded plant. The progeny obtained was half yellow seeded and half green seeded . <BR>i) Write the genotype of yellow seeded progeny. <BR>ii)Write the technical name of the cross.

asked Apr 23, 2019 by priyanka.clay6

1 answer

The following table shows the genotypes for ABO blood grouping and their phenotypes

asked Apr 23, 2019 by priyanka.clay6

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What is trisomy ? Give one example.

asked Apr 23, 2019 by priyanka.clay6

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Justify the situation that in human beings *** of the child is determined by father and not by mother ?

asked Apr 23, 2019 by priyanka.clay6

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The genes for hemophilia are located on *** chromosome of humans. It is normally impossible for a hemophilic father to pass the gene to his son. Why?

asked Apr 23, 2019 by priyanka.clay6

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A mother with blood group ${=}^{B'}$ has a fetus with blood group $-A'$ father is ${=}^{A'}$. Explain the situations?

asked Apr 23, 2019 by priyanka.clay6

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State which law of Mendelian inheritance is expressed in the following diagram?

asked Apr 23, 2019 by priyanka.clay6

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What is a point mutation? Give an example

asked Apr 23, 2019 by priyanka.clay6

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Briefly mention the contributions of T.H.Morgan in genetics.

asked Apr 23, 2019 by priyanka.clay6

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Write the scientific name of the organism which T.H. Morgan used in his genetic experiments.

asked Apr 23, 2019 by priyanka.clay6

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Who had proposed the chromosomal theory of inheritance?

asked Apr 23, 2019 by priyanka.clay6

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Write the possible genotypes Mendel got when he crossed $F_1$ Tall pea plants with a dwarf pea plant.

asked Apr 23, 2019 by priyanka.clay6

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State the difference between a gene and an allele.

asked Apr 23, 2019 by priyanka.clay6

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Which of the following is a dominant & recessive trait in garden pea - Tall stem, constricted pod.

asked Apr 23, 2019 by priyanka.clay6

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If a human zygote has XXY * chromosomes along with 22 pairs of autosomes. What * will the individual be? Name the syndrome

asked Apr 23, 2019 by priyanka.clay6

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In a monohybrid cross the genotypic and phenotypic ratio is 1:2:1. What type of Inheritance is it an example of? Give one example

asked Apr 23, 2019 by priyanka.clay6

1 answer

Why did Mendel select pea plant for his experiment?

asked Apr 23, 2019 by priyanka.clay6

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Mendel‘s work was rediscovered by three scientists independently. Name any two of them.

asked Apr 23, 2019 by priyanka.clay6

1 answer

Define adaptation. What is the adaptation shown by - a, whales, b, kangaroo rat, c, polar bear. Why do cold regions have no small animals?

asked Apr 23, 2019 by priyanka.clay6

1 answer

What factors contribute to growth in population. In what way does logistic growth differ from exponential growth?

asked Apr 23, 2019 by priyanka.clay6

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Define population and population density. How is it estimated? What are the attributes that determine the population characteristics?

asked Apr 23, 2019 by priyanka.clay6

1 answer

Give examples of biochemical adaption and behavioural adaptations shown by organisms.

asked Apr 23, 2019 by priyanka.clay6

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Give examples of adaptation to desert condition shown by organisms.

asked Apr 23, 2019 by priyanka.clay6

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What is altitude sickness? How does the body overcome this?

asked Apr 23, 2019 by priyanka.clay6

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What alternatives do organisms take if stressful external conditions are localized ? Give examples.

asked Apr 23, 2019 by priyanka.clay6

1 answer

How does constancy in the internal environment help an organism? How do organisms achieve it with regard to temperature? Give example.

asked Apr 23, 2019 by priyanka.clay6

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What are the factors that lead to the variation in the conditions of the habitat?

asked Apr 23, 2019 by priyanka.clay6

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Name the major biomes and the factors by which they vary.

asked Apr 23, 2019 by priyanka.clay6

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Give three example of mutualistic relationship.

asked Apr 23, 2019 by priyanka.clay6

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What are the roles of predators?

asked Apr 23, 2019 by priyanka.clay6

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Species facing competition might evolve mechanism that promotes coexistence rather than exclusion. Justify this statement in light of Gause’s competitive exclusion principle, citing suitable examples.

asked Apr 23, 2019 by priyanka.clay6

1 answer

How will you measure population density in following cases ? <br> a) Fish in a lake <br> b) Tiger census in a national park <br> c) Single huge banyan tree with large canopy.

asked Apr 23, 2019 by priyanka.clay6

1 answer

Darwin showed that even a slow growing animal like elephant could reach enormous number in absence of checks. With the help of your understanding of growth models, explain when is this possible? Why is this notion unrealistic?

asked Apr 23, 2019 by priyanka.clay6

1 answer

How does Ophrys get pollinated by bees?

asked Apr 23, 2019 by priyanka.clay6

1 answer

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