Biology
A certain couple got only four daughters in a row and no son. Does it mean that the husband does not produce Y-bearing sperms? Explain.
Answer
No, it does not mean that the husband does not produce Y-bearing sperms. During conception, half of the sperm released are X-bearing and the other half are Y-bearing. In this case, only the X-bearing sperm fertilized the wife's eggs in each instance. This can happen due to random chance, as the probability of having a male or female child is approximately 50% for each pregnancy.
Related Questions
Which of the following in humans are established genetic traits ? (Tick-mark the correct ones) in the box provided.
(i) Capacity to be a good cricketer
(ii) Curly hair
(iii) Left-handedness
(iv) Quality of voice
(v) Red-green colour blindness
Mention the following:
(i) Total number of pairs of chromosomes in each body cell in humans …………… .
(ii) Number of pairs of autosomes in one cell of humans …………… .
Write the basic unit of heredity ?
Define the following terms :-
(i) Allele
(ii) Dominant gene
(iii) Genotype
(iv) Phenotype
(v) Recessive gene