State True or False (w.r.t. following diagrams)

(i) During gamete formation, only 50 % of the sperm bear X-chromosome.
(ii) Both male and female individuals have same type of sex chromosomes.

Which of the following statement for the grasshopper is incorrect ? (1) Male individual is heatrogametic due to two heteromorphic sex chromosomes (2) Sperm determines the sex of offsprings (3) Similar number of autosomes are found in male and female individuals both (4) All eggs contain autosomes as well as X-chromosome.

Which of the following statement for the grasshopper is incorrect ? (1) Male individual is heatrogametic due to two heteromorphic sex chromosomes (2) Sperm determines the sex of offsprings (3) Similar number of autosomes are found in male and female individuals both (4) All eggs contain autosomes as well as X-chromosome.

State True or False (w.r.t Chromosomal theory of inheritance) (i) Both chromosomes as well as genes occur pairs in the somatic cells (ii) Both chromosomes as well genes segregate at the time of gamete formation such that complete pair is transmitted to a gamete (iii) Chromosomes are the carries of Mendel's factors (iv) The paired condition of both chromosomes as weel as Medellan factors is restored during microsporogenesis .

State True or False (w.r.t Chromosomal theory of inheritance) (i) Both chromosomes as well as genes occur in pairs in the somatic cells (ii) Both chromosomes as well genes segregate at the time of gamete formation such that complete pair is transmitted to a gamete (iii) Chromosomes are the carriers of Mendel's factors (iv) The paired condition of both chromosomes as well as Mendelian factors is restored during microsporogenesis .

The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote. (a) What are chromosomes (i) B (ii) D, and (iii) E ? (b) Out of B, D and E, which two chromosomes are of the same type ? (c) Which chromosome is smaller in size ? (d) What is the general name of chromosomes such as B and E ? (e) Out of the two persons A and C, which one is (i) male, and (ii) female ?

State true or false : (i) In few lower plants both gametes are motile. (ii) Pollen tube can carry both male or female gamete.

State true or false : (i) In few lower plants both gametes are motile. (ii) Pollen tube can carry both male or female gamete.

" Females have same number of chromosomes as males,but produces two different types of gametes in the case "