Determination of sex is more complicated than you thought. It describes the environmental and genetic phenomena which impact sex differentiation. This technique makes use of different genes and mechanisms to lay down activities in females and males regulating a shared gene switch. It controls the development of sexual behaviour.
1. In an entity with genetic composition AA+XXY such as Drosophila will be a normal female. In the case of mammals, it will be?
(a) Turner
(b) Klinefelter
(c) Normal female
(d) Normal male
Answer: (b)
2. ______________ discovered XY sex chromosomes
(a) M J D White
(b) Nettil Stevans
(c) R Brown
(d) Mendel
Answer: (b)
3. In this plant, sex determination was first studied
(a) Mirabilis
(b) Melandrium
(c) Datura
(d) Rumex
Answer: (b)
4. This technique can be used to detect the chromosomal abnormality of an unborn baby
(a) Tissue culture
(b) Ultrasound
(c) CAT Scanning
(d) Amniocentesis
Answer: (d)
5. A foetus’ determination of gender is dependent on
(a) mother’s age
(b) father’s health
(c) egg’s nature
(d) sperm’s nature
Answer: (d)
6. This number of Barr bodies are found in a female with XXXX chromosomes
(a) Four
(b) Three
(c) Two
(d) One
Answer: (b)
7. If a boy has sexual characters of that of a girl, its genotype would be
(a) XYY
(b) XO
(c) XXY
(d) XXX
Answer: (c)
8. Theory of linkage was put forward by
(a) De Vries
(b) Sutton
(c) Bateson and Punnet
(d) Morgan
Answer: (d)
9. The chromosomes accounted for sex determination are referred to as
(a) Heterosis
(b) Multiple alleles
(c) Allosomes
(d) Autosomes
Answer: (c)
10. The condition of Free martin is observed in
(a) Frog
(b) Rabbit
(c) Goat/sheep etc
(d) Man
Answer: (c)
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