In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the males are XY. The gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y sex chromosome. Type of male gametes:Read more
In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the males are XY.
The gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y sex chromosome.
Type of male gametes: 22+X OR 22+ Y.
However, since the females have XX sex chromosomes, their gametes can only have X sex chromosome.
Type of female gamete: 22+X
Thus, the mother provides only X chromosomes. The sex of the baby is determined by the type of male gamete (X or Y) that fuses with the X chromosome of the female.
No. This information is not sufficient to determine which of the traits - blood group A or O - is dominant. This is because we do not know about the blood group of all the progeny. Blood group A can be genotypically AA or AO. Hence, the information is incomplete to draw any such conclusion.
No. This information is not sufficient to determine which of the traits – blood group A or O – is dominant. This is because we do not know about the blood group of all the progeny.
Blood group A can be genotypically AA or AO. Hence, the information is incomplete to draw any such conclusion.
Mendel crossed pure breeding tall plants having round seeds with pure breeding short plants having wrinkled seeds. The plants of F1 generation were all tall with round seeds indicating that the traits of tallness and round seeds were dominant. Self breeding of F1 yielded plants with characters of 9Read more
Mendel crossed pure breeding tall plants having round seeds with pure breeding short plants having wrinkled seeds. The plants of F1 generation were all tall with round seeds indicating that the traits of tallness and round seeds were dominant. Self breeding of F1 yielded plants with characters of 9 tall round seeded, 3 tall wrinkled seeded , 3 short round seeded and one short wrinkled seeded. Tall wrinkled seeded and short round seeded plants are new combinations which can develop only when the traits are inherited independently.
The trait which appears in all the members of F1 generation and also in 75% numbers of F2 generation obtained by self fertilization of F1 generation is dominant character. The trait which does not appear in F generation but after self-fertilization of F1 generation, reappears in 25% of F2 generationRead more
The trait which appears in all the members of F1 generation and also in 75% numbers of F2 generation obtained by self fertilization of F1 generation is dominant character.
The trait which does not appear in F generation but after self-fertilization of F1 generation, reappears in 25% of F2 generation is known as recessive.
Because the image is real, so magnification m must be negative. m = -v/u -3 = -v/-10 v = -30 Thus the image is located at a distance of 30 cm from the mirror.
Because the image is real, so magnification m must be negative.
m = -v/u
-3 = -v/-10
v = -30
Thus the image is located at a distance of 30 cm from the mirror.
Earlier, the windmills were used to harness wind energy to do mechanical work such as lifting/drawing water from a well. Today, windmills are used to generate electricity.In windmills, the kinetic energy of wind is harnessed and converted into electricity. Water energy which was used for transportatRead more
Earlier, the windmills were used to harness wind energy to do mechanical work such as lifting/drawing water from a well. Today, windmills are used to generate electricity.In windmills, the kinetic energy of wind is harnessed and converted into electricity.
Water energy which was used for transportation before is now a good source to generate electricity. Dams has been constructed on river for generating electricity. Waterfalls were used as a source of potential energy which was converted to electricity with the help of turbines.
Fossil fuels which are traditionally used by human beings everywhere as an energy sources are non-renewable sources of energy. These sources of energy are limited and will disappear after some time. They are being consumed at a large rate. Therefore, we should conserve the energy sources. Hence, weRead more
Fossil fuels which are traditionally used by human beings everywhere as an energy sources are non-renewable sources of energy. These sources of energy are limited and will disappear after some time. They are being consumed at a large rate. Therefore, we should conserve the energy sources. Hence, we should look for alternate sources of energy.
The disadvantages of fossil fuels are: 1. Burning of coal and petroleum produces a lot of pollutants causing air pollution. 2. Fossil fuels release oxides of carbon, nitrogen, sulphur, etc. that cause acid rain, which affects the soil fertility and potable water. 3. Burning of fossil fuels produce gRead more
The disadvantages of fossil fuels are:
1. Burning of coal and petroleum produces a lot of pollutants causing air pollution.
2. Fossil fuels release oxides of carbon, nitrogen, sulphur, etc. that cause acid rain, which affects the soil fertility and potable water.
3. Burning of fossil fuels produce gases such as carbon dioxide that causes global warming.
Non-biodegradable substances affect the environment by: 1. They contaminate soil and water resources as they cannot be decomposed by micro-organisms. 2. These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.
Non-biodegradable substances affect the environment by:
1. They contaminate soil and water resources as they cannot be decomposed by micro-organisms.
2. These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.
How is the sex of the child determined in human beings?
In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the males are XY. The gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y sex chromosome. Type of male gametes:Read more
In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the males are XY.
See lessThe gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y sex chromosome.
Type of male gametes: 22+X OR 22+ Y.
However, since the females have XX sex chromosomes, their gametes can only have X sex chromosome.
Type of female gamete: 22+X
Thus, the mother provides only X chromosomes. The sex of the baby is determined by the type of male gamete (X or Y) that fuses with the X chromosome of the female.
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
No. This information is not sufficient to determine which of the traits - blood group A or O - is dominant. This is because we do not know about the blood group of all the progeny. Blood group A can be genotypically AA or AO. Hence, the information is incomplete to draw any such conclusion.
No. This information is not sufficient to determine which of the traits – blood group A or O – is dominant. This is because we do not know about the blood group of all the progeny.
See lessBlood group A can be genotypically AA or AO. Hence, the information is incomplete to draw any such conclusion.
How do Mendel’s experiments show that traits are inherited independently?
Mendel crossed pure breeding tall plants having round seeds with pure breeding short plants having wrinkled seeds. The plants of F1 generation were all tall with round seeds indicating that the traits of tallness and round seeds were dominant. Self breeding of F1 yielded plants with characters of 9Read more
Mendel crossed pure breeding tall plants having round seeds with pure breeding short plants having wrinkled seeds. The plants of F1 generation were all tall with round seeds indicating that the traits of tallness and round seeds were dominant. Self breeding of F1 yielded plants with characters of 9 tall round seeded, 3 tall wrinkled seeded , 3 short round seeded and one short wrinkled seeded. Tall wrinkled seeded and short round seeded plants are new combinations which can develop only when the traits are inherited independently.
See lessHow do Mendel’s experiments show that traits may be dominant or recessive?
The trait which appears in all the members of F1 generation and also in 75% numbers of F2 generation obtained by self fertilization of F1 generation is dominant character. The trait which does not appear in F generation but after self-fertilization of F1 generation, reappears in 25% of F2 generationRead more
The trait which appears in all the members of F1 generation and also in 75% numbers of F2 generation obtained by self fertilization of F1 generation is dominant character.
See lessThe trait which does not appear in F generation but after self-fertilization of F1 generation, reappears in 25% of F2 generation is known as recessive.
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
Because the image is real, so magnification m must be negative. m = -v/u -3 = -v/-10 v = -30 Thus the image is located at a distance of 30 cm from the mirror.
Because the image is real, so magnification m must be negative.
m = -v/u
-3 = -v/-10
v = -30
Thus the image is located at a distance of 30 cm from the mirror.
See lessFind the focal length of a convex mirror whose radius of curvature is 32 cm.
R= 32 cm Radius of curvature = 2 × Focal length (f) R= 2f= R/2 = 32/2 = 16 Hence, the focal length of the given convex mirror is 16 cm.
R= 32 cm
See lessRadius of curvature = 2 × Focal length (f)
R= 2f= R/2 = 32/2 = 16
Hence, the focal length of the given convex mirror is 16 cm.
How has the traditional use of wind and water energy been modified for our convenience?
Earlier, the windmills were used to harness wind energy to do mechanical work such as lifting/drawing water from a well. Today, windmills are used to generate electricity.In windmills, the kinetic energy of wind is harnessed and converted into electricity. Water energy which was used for transportatRead more
Earlier, the windmills were used to harness wind energy to do mechanical work such as lifting/drawing water from a well. Today, windmills are used to generate electricity.In windmills, the kinetic energy of wind is harnessed and converted into electricity.
See lessWater energy which was used for transportation before is now a good source to generate electricity. Dams has been constructed on river for generating electricity. Waterfalls were used as a source of potential energy which was converted to electricity with the help of turbines.
Why are we looking at alternate sources of energy?
Fossil fuels which are traditionally used by human beings everywhere as an energy sources are non-renewable sources of energy. These sources of energy are limited and will disappear after some time. They are being consumed at a large rate. Therefore, we should conserve the energy sources. Hence, weRead more
Fossil fuels which are traditionally used by human beings everywhere as an energy sources are non-renewable sources of energy. These sources of energy are limited and will disappear after some time. They are being consumed at a large rate. Therefore, we should conserve the energy sources. Hence, we should look for alternate sources of energy.
See lessWhat are the disadvantages of fossil fuels?
The disadvantages of fossil fuels are: 1. Burning of coal and petroleum produces a lot of pollutants causing air pollution. 2. Fossil fuels release oxides of carbon, nitrogen, sulphur, etc. that cause acid rain, which affects the soil fertility and potable water. 3. Burning of fossil fuels produce gRead more
The disadvantages of fossil fuels are:
See less1. Burning of coal and petroleum produces a lot of pollutants causing air pollution.
2. Fossil fuels release oxides of carbon, nitrogen, sulphur, etc. that cause acid rain, which affects the soil fertility and potable water.
3. Burning of fossil fuels produce gases such as carbon dioxide that causes global warming.
Give any two ways in which non-biodegradable substances would affect the environment.
Non-biodegradable substances affect the environment by: 1. They contaminate soil and water resources as they cannot be decomposed by micro-organisms. 2. These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.
Non-biodegradable substances affect the environment by:
See less1. They contaminate soil and water resources as they cannot be decomposed by micro-organisms.
2. These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.