Does genetic combination of mother play a significant role in determining the sex of a new born baby ?
No, because mother has a pair of X chromosomes. All new born babies will inherit an X chromosome from mother whether they are baby boys or baby girls.
Which of the processes, sexual reproduction or asexual reproduction, brings about maximum variations in the offsprings ?
”The sex of the children is determined by what they inherit from their father and not their mother.” Justify.
Choose the one term from the following which includes the other three :
broccoli, wild cabbage, cauliflower, cabbage
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually ? Give reason for your answer.
Explain the mechanism of sex determination in humans. [All India]
Or
With the help of a flow chart explain in brief how the sex of a newborn is genetically determined in human beings. Which of the two parents, the mother or the father, is responsible for determination of sex of a child? [Foreign]
Name five varieties of vegetables which have been produced from ‘wild cabbage’ by the process of artificial selection.
State one characteristic which shows that the birds are very closely related to dinosaurs.
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% Of the same population, which trait is likely to have arisen earlier ?
An individual cannot pass on to its progeny the experiences of its lifetime.” Justify the statement with the help of an example and also give reason for the same. [Foreign]
What type of plants were used by Mendel for conducting his experiments on inheritance ?
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.
Study the following cross and showing self-pollination in Flf fill in the blank and answer the question that follows
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Out of bacteria, spider, fish and chimpanzee, which organism has a better body design in evolutionary terms ? Give reason for your answer.
Give an example of body characteristics used to determine how close two species are in terms of evolution and explain it. [All India]
What is meant by the term speciation? List four factors which could lead to speciation. [Delhi]
The forelimbs of a frog, a bird and a man show the same basic design (or basic structure) of bones. What name is given to such organs ?
In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.
Write the names of at least three inorganic molecules which helped in the origin of life on the earth.
Define the term ‘evolution’. “Evolution cannot be equated with progress”. Justify this statement. [Delhi]
What are the different ways in which individuals with a particular trait may increase in a population ?
What is meant by analogous organs? Taking a suitable example, explain how they support the theory of Organic Evolution.
What are homologous organs? Can the wing of a butterfly and the wing of a bat be regarded as homologous? Why? [All India]
Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors ?
Can the wing of butterfly and the wing of a bat be considered homologous organs ? Why or why not ?
Explain how sexual reproduction gives rise to more viable variations that asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually ?
Does genetic combination of mother play a significant role in determining the sex of a new born baby ?
Fill in the following blanks with suitable words :Fill in the following blanks with suitable words :
(a) The human forelimb and bat’s forelimb are an example of……………………organs whereas an insect’s wing and a bat’s wing are an example of…………………organs.
(b) The evolution of eye is an example of evolution by…………………
(c) The scientific name of all human beings is……………………..
(d) Broccoli has evolved from……………..by the process of artificial selection.
(e) The theory of natural selection for evolution was proposed by………………………