Sex Determination
Trending Questions
A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc×AaBbCc, the phenotypic ratio of the offsprings was observed as 1:6:x:20:x:6:1 What is the possible value of x?
3
9
15
25
Give two examples where environmental factors govern the sex determination.
The sex of a child is determined by which of the following ?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of an X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
Question 6
In human males, all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are
(i) Large chromosome
(ii) Small chromosome
(iii) Y-chromosome
(iv) X-chromosome
(a) (i) and (ii)
(b) (iii) only
(c) (iii) and (iv)
(d) (ii) and (iv)
What are the chromosomes XY and XX known as ?
In His Letter To Charley, Sam Writes, ‘…Then I Got To Believing You Were Right.’ What Could Have Made Sam Begin To Believe?
What are the allosomes and autosomes?
In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.
= unaffected female
= Mating between relatives
= unaffected male
= Male affected
- 1:1:2
- 1:1
- 3:1
- 1:2:1
Can two curly-haired parents have a straight-haired child?
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
copies of the same chromosome
two different chromosomes
sex chromosomes
any chromosome
(a) If a normal human cell has 46 chromosomes , how many chromosomes will be there in a human
(i) sperm cell,
(ii) zygote ?
(b) What sizes of plants are produced if both parents have genes Tt?
The number of pairs of autosomes in a human cell is
Which of the two, sperm or ovum, decides the sex of the child ?
Question 30
In human beings, the statistical probability of getting either a male or female child is 50:50. Give a suitable explanation.
(a)
(i) Which parents is the mother?
(ii) Explain why did you choose this parent.
(b) Another child is expected. What are the chances of it being a girl?
Which of the following combinations of sex chromosomes produce a male child
XX or XY ?
Which of the following is the phenotypic monohybrid ratio in F2 generation?
1:2:1
1:3
3:1
2:1:1
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosomes D in half of the gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, the combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
In human beings, the sex chromosomes are denoted as ______
X and Y
X and O
Z and W
Z and O
A new born child has an XY pair of chromosmes. Will it result in being a baby boy or a baby girl ?
The number of chromosomes in human being is:
23 Pairs
46 Pairs
22 Pairs
48 Pairs
How many autosomes are found in a single mature human sperm?
Question 7
The maleness of a child is determined by
(a) the X chromosome in the zygote
(b) the Y chromosome in the zygote
(c) the cytoplasm of the germ cell which determines the sex
(d) sex is determined by chance
In a human, how many chromosomes are present in :
(a) a brain cell ?
(b) a sperm in the testes ?
(c) an egg which has just been produced by the ovary ?
(d) a skin cell ?
(e) a fertilised egg ?
The human male gamete with X chromosome fuses with a female gamete to form a zygote. The offspring will be a male child.
True
False
The sex chromosome of different organisms are given above. Which of the following are incorrectly marked?
- Human, Bird and Grasshopper
- Grasshopper, Human and Fish
- Fish, Cockroach and Human
- Cockroach and Bird
