A black mouse mates with a brown mouse, and all the offspring's are black. Explain.

Open in App

Solution

When the black mouse mates with the brown mouse to give all black offspring it means that the black allele of skin colour is dominant over the brown allele of skin colour. In heterozygous condition, the black allele will express itself thus giving a black coloured phenotype to the mouse. The skin colour is a trait that has two alleles - dominant black allele and recessive brown allele and its selective expression will determine the skin colour of the mouse.

Suggest Corrections

Similar questions

A black mouse mates with a brown mouse, and all the offsprings are black.

(a) Why are no brown offsprings produced ?

(b) If two of the black offsprings mate with each other what kind of offspring would you expect and in what proportions ? Give reason for your answer.

Q. The tails of a male and female mouse are cut and they are mated to produce offspring. The offspring however has a tail. Why did the offspring develop a tail when its parents did not have one?

Q. Choose the correct answer from the alternatives given.

In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?

Q. When a yellow mouse was crossed to another yellow mouse, the

F_{1}

generation produces yellow and brown-black mice in the ratio 2 : 1. The yellow mice are never homozygous. The reason is

Q. (a) In an experiment Griffith introduced heat-killed S-strain bacteria Streptococcus into a mouse along with live R-strain bacteria. The mouse died but the scientist recovered living S-strain bacteria from the dead mouse. Explain the conclusion Griffith arrived at after the experiment.
(b) Explain MacLeod, McCarty and Averys work that followed Griffith's experiment. State the conclusion they arrived at.

Join BYJU'S Learning Program