1) Down syndrom is characterized by

2) The mode of inheritance for the trait – Fragile X syndrome is________.

(a) X linked dominant

(b) X linked recessive

(c) Autosomal dominant

(d) Autosomal recessive

3) Which of the following is a trait of X-linked recessive?

(a) Albinism

(b) Haemophilia

(c) Huntington’s disease

(d) None of these

4) Alpha 1 anti-trypsin deficiency is an autosomal recessive genetic disorder. What are the chances that any of the offspring do not express the disease phenotype if both parents are genotype (Aa)?

(a) 100 per cent

(b) 75 per cent

(c) 50 per cent

(d) 25 per cent

5) Cystic fibrosis is an autosomal recessive genetic disorder. What are the chances that the child would have the disease if any one of the parent (either mother or father)is a carrier of the faulty cystic fibrosis gene (Cc)?

(a) 100 per cent

(b) 50 per cent

(c) 25 per cent

(d) 0 per cent

6) What will be the condition of the progeny if the father is normal, while the mother has one gene for haemophilia and one gene for colour blindness on one of the X chromosomes?

(a) Only daughters are haemophilic and colour blind

(b) Both sons and daughters will be haemophilic and colour blind

(c) 50 per cent haemophilic and colour blind sons and 50% normal sons

(d) 50 per cent haemophilic colour blind daughters and 50% colour blind daughters

7) Which of the following genotypes and phenotypes in a man may be the correct result of aneuploidy in sex chromosomes?

(a) 22 pairs + Y females

(b) 22 pairs + XY females

(c) 22 pairs + XXY females

(d) 22 pairs + XXXY female

8) Which of the following disorder is an example of point mutation?

(a) Sickle cell anaemia

(b) Down’s syndrome

(c) Night blindness

(d) Thalassemia

9) Which of the following disorder is also called the Royal disease?

(a) Colour blindness

(b) Haemophilia

(c) Sickle cell anaemia

(d) Alzheimer’s disease

10) Which of the following is a type of autosomal recessive genetic disorder?

(a) Haemophilia

(b) Skeletal dysplasia

(c) Sickle cell anaemia

(d) None of the above

Segregation of Mendelian factors (no linkage, no
crossing over) occurs during
(a) anaphase I                       (b) anaphase II
(c) diplotene                          (d) metaphase I. (1992)

In a plant, red fruit (R) is dominant over yellow fruit
(r) and tallness (T) is dominant over shortness (t).
If a plant with RRTt genotype is crossed with a plant
that is rrtt,
(a) 25% will be tall with red fruit
(b) 50% will be tall with red fruit
(c) 75% will be tall with red fruit
(d) all the offspring will be tall with red fruit.
(2004)

In Mendel’s experiments with garden pea, round
seed shape (RR) was dominant over wrinkled
seeds (rr), yellow cotyledon (YY) was dominant
over green cotyledon (yy). What are the expected
phenotypes in the F2 generation of the cross
RRYY × rryy?
(a) Round seeds with yellow cotyledons, and
wrinkled seeds with yellow cotyledons
(b) Only round seeds with green cotyledons
(c) Only wrinkled seeds with yellow cotyledons
(d) Only wrinkled seeds with green cotyledons
(2006)

Ratio of complementary genes is
(a) 9 : 3 : 4                     (b) 12 : 3 : 1
(c) 9 : 3 : 3 : 4                (d) 9 : 7. (2001)

The frequency of recombination between gene
present on the same chromosome as a measure of
the distance between genes was explained by
(a) Sutton Boveri                            (b) T.H. Morgan
(c) Gregor J.Mendel                       (d) Alfred Sturtevant.
(NEET 2019)

Experimental verification of the chromosomal
theory of inheritance was done by
(a) Mendel                              (b) Sutton
(c) Boveri                                (d) Morgan. (NEET 2020)

Mendel’s last law is
(a) segregation
(b) dominance
(c) independent assortment
(d) polygenic inheritance. (1991)

The genotype of a plant showing the dominant
phenotype can be determined by
(a) test cross                              (b) dihybrid cross
(c) pedigree analysis                (d) back cross. (2010)

F2 generation in a Mendelian cross showed that both
genotypic and phenotypic ratios are same as 1 : 2 : 1.
It represents a case of
(a) co-dominance
(b) dihybrid cross
(c) monohybrid cross with complete dominance
(d) monohybrid cross with incomplete dominance.
(2012)

The genotypes of a husband and wife are IAIB and IAi.
Among the blood types of their children, how many
different genotypes and phenotypes are possible?
(a) 3 genotypes; 4 phenotypes
(b) 4 genotypes; 3 phenotypes
(c) 4 genotypes; 4 phenotypes
(d) 3 genotypes; 3 phenotypes (NEET 2017)

Identify the wrong statement with reference to the
gene ‘I’ that controls ABO blood groups.
(a) The gene (I) has three alleles.
(b) A person will have only two of the three alleles.
(c) When IA and IB are present together, they
express same type of sugar.
(d) Allele i does not produce any sugar.
(NEET 2020)

Which one from those given below is the period for
Mendel’s hybridisation experiments?
(a) 1840-1850              (b) 1857-1869
(c) 1870-1877              (d) 1856-1863
(NEET 2017)

Among the following characters, which one was not
considered by Mendel in his experiments on pea?
(a) Trichomes-Glandular or non-glandular
(b) Seed-Green or yellow
(c) Pod-Inflated or constricted
(d) Stem-Tall or dwarf                              (NEET 2017)

How many true breeding pea plant varieties did
Mendel select as pairs, which were similar except in
one character with contrasting traits?
(a) 4                    (b) 2
(c) 14                  (d) 8                                      (NEET 2020)