The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
Different ways in which individuals with a particular trait may increase in a population are as follow : If it gives the benefit of survival through natural selection. Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
Different ways in which individuals with a particular trait may increase in a population are as follow :
If it gives the benefit of survival through natural selection.
Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substRead more
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substances from the mother to the embryo.
The various changes occur in girls at puberty are : Hair grow under armpits and pubic region. Mammary glands (or breasts) develop and enlarge. The hips broaden. Extra fat is deposited in various parts of the body like hips and thighs. Fallopian tube, uterus and vagina enlarge. Ovaries start to releaRead more
The various changes occur in girls at puberty are :
Hair grow under armpits and pubic region.
Mammary glands (or breasts) develop and enlarge.
The hips broaden.
Extra fat is deposited in various parts of the body like hips and thighs.
Fallopian tube, uterus and vagina enlarge.
Ovaries start to release eggs.
Menstruation (monthly periods) starts.
Feelings and sexual drives associated with adulthood begin to develop.
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.
Why are traits acquired during the life-time of an individual not inherited?
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
See lessWhat are the different ways in which individuals with a particular trait may increase in a population?
Different ways in which individuals with a particular trait may increase in a population are as follow : If it gives the benefit of survival through natural selection. Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
Different ways in which individuals with a particular trait may increase in a population are as follow :
- If it gives the benefit of survival through natural selection.
- Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
See lessHow does the embryo get nourishment inside the mother’s body?
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substRead more
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substances from the mother to the embryo.
See lessWhat are the changes seen in girls at the time of puberty?
The various changes occur in girls at puberty are : Hair grow under armpits and pubic region. Mammary glands (or breasts) develop and enlarge. The hips broaden. Extra fat is deposited in various parts of the body like hips and thighs. Fallopian tube, uterus and vagina enlarge. Ovaries start to releaRead more
The various changes occur in girls at puberty are :
- Hair grow under armpits and pubic region.
- Mammary glands (or breasts) develop and enlarge.
- The hips broaden.
- Extra fat is deposited in various parts of the body like hips and thighs.
- Fallopian tube, uterus and vagina enlarge.
- Ovaries start to release eggs.
- Menstruation (monthly periods) starts.
- Feelings and sexual drives associated with adulthood begin to develop.
See lessWhat is the role of the seminal vesicles and the prostate gland?
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
See less(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.