What Is Gametogenesis

Q.

What is syngamy?

Q.

How many meiotic divisions occur to produce 100 pollen grains?

Q. The spread of living pteridophytes is limited and is restricted to narrow geographical regions because

1. gametophytic growth needs cool, damp and shady places
2. there is a requirement of water for fertilization
3. there is no stomata or vascular tissue in the leaf
4. both (a) and (b)

Q. Match column I with column II with respect to the findings of the Human genome project and choose the correct option.
$$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{1. Maximum genes on a chromosome}& \text{A. Y chromosome}\\ \text{2. Largest gene}& \text{B. 3164.7 million bp}\\ \text{3. Total base pairs}& \text{C. 2.4 million base pairs}\\ \text{4. Least genes on a chromosome}& \text{D. 2968}\end{array}$$

1. 1-A, 2-C, 3-D, 4-B
2. 1-D, 2-C, 3-B, 4-A
3. 1-D, 2-B, 3-C, 4-A
4. 1-C, 2-D, 3-B, 4-A

Q. Among animals, for example birds, do they lay eggs all through the year? Or is it a seasonal phenomenon? What about other animals like frogs and lizards?

Q. Consider the following statements regarding HGP.
1. The Human Genome Project (HGP) was completed in 2010.
2. Less than 50% of the human genome codes for proteins.

1. Statement 1 is correct but statement 2 is incorrect
2. Statement 2 is correct but statement 1 is incorrect
3. Both the statements are correct
4. Both the statements are incorrect

Q.

What is the process of cleavage?

Q. How many chromosomes will be there in the zygote?

Q.

Differentiate between gametogenesis from embryogenesis.

Q. The birds/hens in captivity (as in poultry farms) can be made to lay eggs throughout the year. In this case, laying eggs is related to

1. reproduction
2. commerical exploitation
3. human welfare
4. both b and c

Q.

Name the reproductive organs of male and female in the humans?

Q. Chromosome 1: __(i)__genes ::___(ii)___ : 231 genes

1. (i)-2345; (ii)-X chromosome
2. (i)-2968; (ii)-Y chromosome
3. (i)-2345; (ii)-Y chromosome
4. (i)-2968; (ii)-X chromosome

Q.

The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

1. A single mating produces two young flies

2. Smaller female is easily recognizable from larger male

3. It reproduces parthenogenetically

4. It completes life cycle in about two weeks

Q.

What are isogametes and anisogametes?

Q.

Find the example where the 4 daughter cells differ from meiosis are equal in size & where they are found in unequal size.

Q.

Are human eggs haploid or diploid?

Q. What are Multipotent cells...?

Q. Define haploid

Q.

During Spermatogenesis, the second meiotic division does not further reduce the chromosome number. Why is it called a meiotic division?

Q. A diploid organism is heterozygous for five loci and homozygous for 2 loci, how many types of gametes can be produced?

1. 32
2. 64
3. 128
4. 16

Q. A person having $I^A{I}^B$ alleles would show ________ blood type and that is because of ____________ of alleles.

1. AB, polygenic inheritance
2. AB, incomplete dominance
3. A, complete dominance
4. AB, codominance

Q. The total number of base pairs in the human genome approximately is___(i)____ and the total estimated cost of the Human genome project (HGP) is___(ii)____.

1. (i) 6 х 10⁸ ; (ii) US $ 9 billion
2. (i) 3 х 10⁹ ; (ii) US $ 3 billion
3. (i) 3 х 10⁸ ; (ii) US $ 9 billion
4. (i) 3 х 10⁹ ; (ii) US $ 9 billion

Q. Explain the genetic basis of blood grouping in the human population. [5]

Q.

What is the theory of Biogenesis?

Q. With respect to the stages of embryo development in dicots, select the correct option.

1. Heart-shaped→ I-shaped→ octant stage→ triangular shaped

2. Triangular shaped→ heart shaped→ octant stage→ I-shaped
3. I-shaped→ octant stage→ heart-shaped→ triangular shaped
4. I-shaped→ octant stage→ triangular-shaped→ heart-shaped

Q. Select the wrong statement :-

1. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
2. Isogametes are similar in structure, function and behavior.
3. Anisogametes differ either in structure, function of behavior
   
4. In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Q. [A]: The ratio between the number of male gametes in male gametophyte to number of female gametes in female gametophyte is 1 : 2
[R]: A female gametophyte has more gametes than male gametophyte

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A and R are false
4. A is true but R is false

Q.

In double fertilisation

1. One male gamete fuses with the antipodal, while the other fuses with the diploid nucleus

2. One male gamete fuses with the egg and the other fuses with the secondary nucleus

3. One male gamete fuses with the egg, while the other fuses with the antipodal

4. Two male gametes fuse with two eggs

Q.

What is the heterozygosity index?

Q.

In how many cells the meiotic division has taken place if the total number of pollen grains (male gametes in a flower) is 32?

1. 16

2. 8

3. 4

4. 5