Name two things that our characteristics can be affected by...
Question 3
3.
Define fertilisation
Question 4
4.
Define control variable
Question 5
5.
Calculate the mean 1.24 1.27 1.29
Question 6
6.
There are two genetically identical plants but one has grown taller than the other. Explain why
Key Knowledge
Question 7
7.
What is a gene?
Question 8
8.
What is an allele?
Question 9
9.
What does dominant mean?
Question 10
10.
What does recessive mean?
Question 11
11.
What does homozygous mean?
Question 12
12.
What does heterozygous mean?
Question 13
13.
What is a genotype?
Question 14
14.
What is a phenotype?
Recall Quiz
Question 15
15.
This allele will always be expressed, even if there is only one. It is represented by an upper case letter...
Question 16
16.
Having the same alleles e.g. blue eyes and blue eyes.
Question 17
17.
The pair of alleles found in your chromosomes e.g. Bb
Question 18
18.
A section of DNA found on a chromosomes which codes for a characteristic.
Question 19
19.
This allele will only be expressed if both alleles are recessive. It is represented by a lower case letter.
Application tasks
Question 20
20.
Blue eyes is caused by a recessive allele (b), whereas brown eyes is caused by a dominant allele (B). One parent has brown eyes and is homozygous, and the other parent has blue eyes. What is the probability that their offspring will have brown eyes. Use a genetic diagram to explain your answer.
Parent phenotype:
Parent genotype:
Punnett square:
Probability:
Question 21
21.
Blue eyes is caused by a recessive allele (b), whereas brown eyes is caused by a dominant allele (B). Both parents have brown eyes and are heterozygous What is the probability that their offspring will have brown eyes. Use a genetic diagram to explain your answer.
Question 22
22.
The inheritance of fur colour in mice is controlled by a single gene. White fur is recessive - a. Grey fur is dominant - A. Two mice that are heterozygous for the fur colour gene mate. Determine the probability that the offspring will have grey fur.
Question 23
23.
The allele for green peas (G) is dominant over the allele for white peas (g). Draw a Punnett square to show the possible offspring when a heterozygous green pea mates with a white pea.