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Heredity and Evolution

A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation

07/11/2024

Science

10th

Heredity and Evolution

In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.

07/11/2024

Science

10th

Heredity and Evolution

Why do all the gametes formed in human females have an X chromosome?

07/11/2024

Science

10th

Heredity and Evolution

Mention three important features of fossils which help in the study of evolution.

07/11/2024

Science

10th

Heredity and Evolution

Do genetic combination of mothers play a significant role in determining the sex of a new born?

07/11/2024

Science

10th

Heredity and Evolution

How is the sex of a newborn determined in humans?

07/11/2024

Science

10th

Heredity and Evolution

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
(a) reptiles have evolved from birds
(b) there is no evolutionary connection between reptiles and birds
(c) feathers are homologous structures in both the organisms
(d) birds have evolved from reptiles

07/11/2024

Science

10th

Heredity and Evolution

The theory of evolution of species by natural selection was given by
(a) Mendel (b) Darwin
(c) Morgan (d) Lamarck

07/11/2024

Science

10th

Heredity and Evolution

The number of pair (s) of sex chromosomes in the zygote of humans is
(a) one (b) two
(c) three (d) four

07/11/2024

Science

10th

Heredity and Evolution

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2  is
(a) 1 : 3
(b) 3 : 1
(c) 1 : 1
(d) 2 : 1

07/11/2024

Science

10th