(a) How does Mendel’s experiment show that traits may be dominant or recessive?
(b) How traits get expressed from parents to offsprings? Explain with an example.
(c) Why are traits acquired during the lifetime of an individual not inherited?
Answers
Answer:
your answer is here !
Explanation:
(a) Mendel in his experiment on the inheritance of traits selected and crossed tall pea plant with dwarf pea plant. The F1 progeny had Tt genotype but the plant was tall. This shows that ‘T’ is dominant trait whereas ‘t’ is recessive.
(b) Traits are passed through DNA. When an egg is fertilized with sperm, the resulting offspring takes 50 percent of its DNA from each parent. This resulting combination of two halves of DNA determines what specific traits the child will have. The expression of traits in an offspring is determined by dominant and recessive genes. If one or both parents pass on a dominant gene to the child, then the dominant gene will be expressed. However, a recessive gene is expressed only in case when both parents pass on the recessive genes to the offspring.
For example, in case of eye colour, the gene for brown eyes is dominant and that for blue eyes is recessive. So if either parent passes on the brown eye gene, then it will be expressed in the child. On the other hand for the expression of blue eye trait, both the parents should pass blue color traits. Thus people with blue eyes have two recessive genes, but people with brown eyes can have one dominant and one recessive gene or both dominant genes.
(c) Only the traits which are passed through DNA of germ cells are inherited to the offsprings during sexual reproduction. On the other hand the traits acquired during lifetime do not pass on to the DNA of germ cells that’s why they cannot be inherited.
follow me !
Answer:(a) Mendel in his experiment on the inheritance of traits selected and crossed tall pea plant with dwarf pea plant. The F1 progeny had Tt genotype but the plant was tall. This shows that ‘T’ is dominant trait whereas ‘t’ is recessive.
(b) Traits are passed through DNA. When an egg is fertilized with sperm, the resulting offspring takes 50 percent of its DNA from each parent. This resulting combination of two halves of DNA determines what specific traits the child will have. The expression of traits in an offspring is determined by dominant and recessive genes. If one or both parents pass on a dominant gene to the child, then the dominant gene will be expressed. However, a recessive gene is expressed only in case when both parents pass on the recessive genes to the offspring.
For example, in case of eye colour, the gene for brown eyes is dominant and that for blue eyes is recessive. So if either parent passes on the brown eye gene, then it will be expressed in the child. On the other hand for the expression of blue eye trait, both the parents should pass blue color traits. Thus people with blue eyes have two recessive genes, but people with brown eyes can have one dominant and one recessive gene or both dominant genes.
(c) Only the traits which are passed through DNA of germ cells are inherited to the offsprings during sexual reproduction. On the other hand the traits acquired during lifetime do not pass on to the DNA of germ cells that’s why they cannot be inherited.
Explanation: