Genetics Flashcards
Who were the three scientists who discovered DNA in 1953?
James Watson, Francis Crick and Rosiland Franklin
If the alleles in a matching pair are the same, they are called…
Homozygeous alleles
The family had a male dog called Patch. He had an eye patch and inherited the dominant allele for an eye patch from each of his parents. Patch was crossed with a female called Snowy, who did not have an eye patch. What is the chance that the dog does not have a patch?
0%
The Deoxyribonucleic acid is a polymer composed of two what?
polynucleotide chains
If the alleles in a matching pair are different they are called….
Heterozygeous alleles
If Patch and Snowy had 3 children what are the combinations of genes that the offspring could have?
Ee
Different versions of a gene, that code for different versions of a characteristic are called…..
Alleles
Reproduction to make members of a species called “offspring”.
This can be achieved 2 different ways. What two ways can this be achieved
Asexually and Sexually
True or False? Dominant allels is always represented as a capital letter.
True
State what is meant by a recessive allele.
An allele whose characteristic is only expressed if the allele is inherited from both your parents.
Two heterozygous black furred cats have had a white furred kitten. What is the probablity of the white furred offspring?
25%
State what is meant by a dominant allele.
An allele of a characteristic that is always expressed in an organism.
Two brown eyed parents have had a baby with blue eyes. They are confused as to how this happened. What is the probabilty of this happening?
25%
A black haired heterozygous man and a blonde haired female are having a child. What is the % probability of the child having black hair?
50%
Draw a punnet square with the gametes being… R,r x R,r
R|RR|Rr|
————–
r|Rr |rr|
