Advertisements
Advertisements
Question
How is the sex of a newborn determined in humans?
Solution
Sex of a newborn in humans is genetically determined, that is, genes inherited from the parents determine the sex of a baby. If a newborn inherits one X chromosome from mother and X chromosome from father, this newborn will become a girl and if a newborn inherits one X chromosome from mother and Y chromosome from father, this newborn will become a boy.
APPEARS IN
RELATED QUESTIONS
What is a dihybrid cross? How did Mendel perform this cross?
In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates
Among the following characters which one was not considered by Mendel in his experimentation pea?
What are the reasons for Mendel’s successes in his breeding experiment?
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that ______.
Two linked genes a and b show 20% recombination. The individuals of a dihybrid cross between ++ /++ × ab/ab shall show gametes ______.
A normal green male maize is crossed with albino female. The progeny is albino because ______.
A dihybrid condition is ______.
Mendel’s last law is ______.
Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
What is the difference between genetic drift and change due to natural selection?
According to the evolutionary theory, formation of a new species is generally due to
From the list given below, select the character which can be acquired but not inherited
Do genetic combination of mothers play a significant role in determining the sex of a new born?
Two pea plants - one with round yellow seeds (RRYY) and another with wrinkled green (rryy) seeds produce F1 progeny that have round, yellow (RrYy) seeds.
When F1 plants are self-pollinated, which new combination of characters is expected in F2 progeny? How many seeds with these new combinations of characters will be produced when a total 160 seeds are produced in F2 generation? Explain with reason.
Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.
Give a reason why only tall plants are observed in F1 progeny.
Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.
When F1 plants were cross-pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.
The ratio of 9 : 3 : 3 : 1 is due to:
