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?
(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 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
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
In human beings, the sex chromosomes are denoted as ______
X and Y
X and O
Z and W
Z and O
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?
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
- XY
- YY
- XX
- XYY
