Draw and label an animal cell:
Year 10: B1 Influences on life
(Part 2)
Draw a punnet square for two heterozygous brown
eyed parents possible offspring. Show parents and
possible gametes
1) How many chromosomes do humans have? …………….
2) What are the chromosomes made of? …………………..
3) What are chromosomes divided up into? ………………
4) What do these sections code for? …………………………
5) Characteristics can have different versions, e.g.
blue or brown eye colour these are on the
Chromosome they are known as ……………………………
6) How many chromosomes do you get from one
parent? ……………..
7) Animals and plants produce ………………. (sex cells)
which leads to ………………….. reproduction.
8) Who was the Austrian Monk who observed pea
plants inherited …………………….. characteristics?
…………………….
9) The alleles present on the chromosomes is known
as the …………………
10) Whereas the characteristic they code for,
which can be “seen” is the …………………..
11) Alleles can come in two distinct ways of showing
themselves a) there only needs to be one to show
itself ………………………………… b) two alleles are needed
to show the characteristic, or it is “hidden”
……………………………………
What is the probability of a) heterozygous brown
eyes………….b) homozygous brown ………………………………..
c) what other possibility is there and what is the
probability of that happening?………………………………………
……………………………………………………………………………………………..
C. F.
Family pedigree
Serena
Dan
Adrian
Dom
Meg
Elle
Sue
Jack
Wina
Male sufferer female sufferer
Leo
Pete
female
Donna
male
Genetic Disorders:
Sickle cell disease is a …………………… allele. To
suffer the disease you must have ………. of the
alleles. If you have …………… allele you are said to
be a ………………….. Symptoms include being short of
breath and easily become tired. Sometimes they
may have ………………. joints because the ……..
…………….. ……….. stick together and ……………. the
blood vessels. This sometimes can be fatal. Being a
carrier or suffering the disease can give some
protection to …………………. .
………………. ………….. (CF) is a …………………. allele, which
means that the allele has come from ………..
…………………. . This faulty allele produces thick ………..
that makes ………………… difficult. This can lead to
infections and damage to the alveoli in the lungs.
It also blocks the mucus that transports enzymes
into the intestine to ………………. food. This can
result in ………………. loss.
Family Pedigree Chart Questions:
1) Name the sufferers of C.F. ………………………………………………………………
2) How did Dan get C.F.? ……………………………………………………………………….
……………………………………………………………………………………………………………………..
3) What can you tell about Dom’s alleles? …………………………………………
……………………………………………………………………………………………………………………..
4) Explain why you can know Elle’s alleles …………………………………………
……………………………………………………………………………………………… ……………………..
………………………………………………………………………………………………………………………
5) What possible genotypes could Jack have? …………………………………
……………………………………………………………………………………………………………………..
6) Does Wina, Pete and Donna help you identify Jack’s genotype,
explain your answer? ………………………………………………………………………………
………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………..
Key words: sexual, dominant, painful, phenotype, mucus, cytoplasm, carrier, recessive discontinuous, cystic fibrosis, red blood cells, genotype, one,
nucleus, 23, recessive, cell membrane, alleles, Mendle, digest, gametes, both parents, breathing, mitochondria, DNA, 46, malaria, genes,
characteristics, recessive, two, block, weight