Traits

Q. Sum total of all genes in an organism is called as a ___ .

Q.

Differentiate between :

(a) genotype and phenotype.
(b) character and trait.
(c) monohybrid and dihybrid cross (phenotypic ratio).

Q.

Visible characteristics of an organism are called__________.

1. phenotypes

2. genotypes

3. homozygous

4. heterozygous

Q.

Which eye color is dominant, Blue or black?

Q. ntwhat is the formula for finding number of gametes, phenotype, genotype for out crossn

Q. ___ is a diagram that is used to predict an outcome of a particular cross or breeding experiment.

Q. List any four traits in humans which you can easily study just by observing and making family charts. [4 MARKS]

Q. If so pea plant with round and green seeds is bred with plant having wrinkled and yellow seeds how many different phenotypes will be observed in F2 generation list them and mention the ratio. Also specify the genotypes of the parents if we take R for round and r for wrinkled and G for green and g for yellow assuming round to be dominant over wrinkled and green over yellow.

Q. What is meant by a monohybrid cross and a dihybrid cross?

Q.

If a tall plant crossed with a dwarf plant, this type of cross is called_______.

1. dihybrid

2. monohybrid

3. reciprocal

4. trihybrid

Q.

Question 9
Select the incorrect statement

(a) Frequency of certain genes in a population change over several generations resulting in evolution.
(b) Reduction in weight of the organism due to starvation is genetically controlled.
(c) Low weight parents can have heavyweight progeny.
(d) Traits which are not inherited over generations do not cause evolution.

Q.

Traits of organism are controlled and regulated by

1. nucleus

2. chromosomes

3. DNA

4. alleles

Q.

If the 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?

Q. Differentiate between: [4 MARKS]
(i) genotype and phenotype
(ii) character and trait

Q.

Select the incorrect statement from the following :
(a) the frequency of certain genes in a population changes over several generations resulting in evolution.
(b) reduction in the weight of an organism due to starvation is genetically controlled
(c) low weight parents can have heavyweight progeny
(d) traits which are not inherited over generations do not cause evolution.

Q.

Suppose eye colour of humans is governed by one gene. If black eye colour is dominant over green eye colour, then which letter correctly represents the dominant allele and the recessive allele respectively?

1. G and B
2. B and b
3. b and g
4. g and B
   

Q. If black eye colour is dominant over green eye colour, which letters correctly represent the dominant and recessive alleles respectively?

1. g and B
2. G and b
3. B and b
4. b and g

Q. If black eye colour is dominant over green eye colour, which letters correctly represent the dominant and recessive alleles respectively?

1. b and g
2. g and B
3. G and b
4. B and b

Q.

Why most of the twins are similar?

Q.

Define the term Allelle.

Q.

What are the disadvantages of vegetative propogation?

Q. Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species ?

Q.

The visible characteristic in an organism is known as :

(a) prototype (b) stereotype (c) phenotype (d) genotype

Q.

What causes outbreeding depression?

Q. Question 1
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?

Q. The product of a cross between two organisms that differ in regard to two different traits is known as a ___.

1. trihybrid cross
2. hybrid cross
3. dihybrid cross
4. monohybrid cross

Q. Question 9
Select the incorrect statement

(a) Frequency of certain genes in a population change over several generations resulting in evolution.
(b) Reduction in weight of the organism due to starvation is genetically controlled.
(c) Low weight parents can have heavy weight progeny.
(d) Traits which are not inherited over generations do not cause evolution.

Q.

Mendel’s typical dihybrid cross is

1. YyRr × YyRr

2. YYRr × yyrr

3. YYRR × yyrr

4. yyrr × yyrr

Q. Which of the following provide first line of defense?

1. Saliva
2. Tears
3. Lymph
4. Mucus
5. RBCs
6. Sweat
7. Keratin
8. WBCs

Q. Assertion [A]: A geneticist crossed two plants. He got 50% tall and 50% dwarf plants in the progeny.

Reason [R]: One parent was heterozygous tall while the other was dwarf.

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 is true but R is false.
4. Both A and R are false.