Genes

Q.

How many genes are present in a chromosome?

Q.

What is Codominance? Explain with an example.

Q.

Fruit color in squash is an example of

1. Dominant epistasis

2. Recessive epistasis

3. Inhibitory genes

4. Complementary genes

Q.

What is an example of variation?

Q.

If here we have two parents of a child father is of fair complexion and mother is of dark complexion then what sort of gene will be inherited to the offspring whether child will have fair or dark complexion if fair is considered as recessive trait and dark as dominant

Q.

A study found that children with light-colored eyes are likely to have parents with light-colored eyes. On this basis, can we say anything about whether the light eye color trait is dominant or recessive? Why or why not?

Q.

Which eye color is more dominant, Brown or Black?

Q.

What is the unit of a chromosome?

Q.

Who is father of DNA?

Q. Red-green colour blindness is a sex-linked inherited characteristic. The gene (allele) b for colour blindness is recessive to the gene B for normal vision. The gene b is carried only on the X chromosome.
(a) Describe these phenotypes.



(b) Explain why red-green colour blindness is more likely to occur in men than in women. [4 MARKS]

Q.

How do multiple alleles affect inheritance?

Q.

Which is the type of Gene that can express in both Homozygous and Heterozygous Conditions?

1. Dominant

2. Recessive

3. Both

4. None

Q.

What is diploid number of chromosomes in dog?

1. 74

2. 75

3. 77

4. 78

Q. Were the tall plants in the F1 generation exactly the same as the tall plants of the parent generation? How do Mendelian experiment s test this?

Q.

Which of the following statements describes a ‘GENE’ ?

1. Specific fragment or sequence of nucleotides

2. RNA Fragment with nucleotides

3. Sister chromatids in a chromosome

4. Protein synthesized by DNA

Q. The inheritance of characters or traits from parents to progeny is called .

1. variation
2. heredity
3. cloning
4. transfusion

Q. Amongst the following, who coined the term ‘chromosome’?

1. W. Waldeyar
2. W.L. Johannsen
3. T.H. Morgan
4. G.J. Mendel

Q.

Which of the following terms refers to the observable physical characteristics of an individual or an organism?

1. Physiotype

2. None of the Above

3. Genotype

4. Phenotype

Q.

Which trait is normally controlled by multiple alleles but not multiple genes?

Q.

‘Phenotype’ refers to ___ .

1. the specific position of a gene on a chromosome

2. the genetic makeup of an organism

3. the physical expression of a trait

4. a condition wherein both the alleles of a gene are similar

Q.

A man having blood group O marries a woman having blood group B and they have a daughter. What will be the blood group of the daughter ?

Q.

The physical expression of genes in an individual.

Q.

Which of the following is an example of codominance?

1. Height of pea plants

2. 4 o’ clock plant

3. AB blood group

4. Skin colour in humans

Q.

How many strands does DNA have after the completion of replication?

Q.

What is diploid number of chromosomes in onion?

1. 15

2. 17

3. 16

4. 14

Q. what is the difference between a chromatin thread, a chromosome and a chromatid?

Q.

What is the special shape of DNA called?

Q.

(a) What are genes ? Where are they located in our body ?

(b) What is meant by dominant genes and recessive genes ? Gives one examples of each.

(c) Explain how, characteristics (or traits) are inhertited through genes.

Q.

Gregor Mendel's first law of genetics states " Of a pair of contrasted characters, only one can be represent in a gamete by its internal 'factor'.

(a) Give the modern name for this 'factor'.

(b) State where these factors are found in gametes.

Q.

A set of observable characteristics of an individual organism is called as _______.

1. Monotype

2. Phenotype

3. Crosstype

4. Genotype