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WorksheetsMIC1008 Tutorial 2
Total questions: 17
Worksheet time: 30mins
A type of allele that is always expressed if it's present
Homozygous
Heterozygous
Dominant
Recessive
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
0%
25%
50%
75%
The dominant trait as seen in this Punnett square is
There is no dominant seed
yellow pea seeds
green pea seeds
shrivelled pea seeds shape
A red flower (Rr) is crossed with a white flower (rr). What is the genotype?
0 RR; 0 Rr: 4 rr
2 RR; 0 Rr: 2 rr
4 RR; 0 Rr: 0 rr
0 RR; 2 Rr: 2 rr
What percentage of the offspring will have this recessive disease?
0%
25%
50%
75%
Color-blindness in humans is a sex-linked trait carried on the X chromosome. XC represents the gene for color-blindness. It is recessive. A woman is color-blind and marries a normal man. She gets pregnant and learns that it will be a boy. What is the chance that he will be color-blind?
0%
25%
50%
100%
Which of the following is homozygous dominant?
Yy
Y
yy
YY
What is the likely ratio of affected children born to parents
both of whom are heterozygous for cystic fibrosis?
1 affected: 3 normal
2 affected: 2 normal
3 affected: 1 normal
All affected
A married couple has a family of 6 boys. What are the chances that the next child will be a girl?
6:1
1:6
3:1
1:1
In tomato plants, a gene controlling fruit shape has 2 alleles: O (round) and o (oval). A gene controlling inflorescence (position of the flowers) has two alleles: S (simple) and s (compound). The map distance between the two genes is 22 cM. A pure-breeding plant with oval fruit and compound inflorescence is crossed with a pure-breeding plant with round fruit and simple inflorescence. The F1 have round fruit and simple inflorescence. The F1 are then crossed to plants with oval fruit and compound inflorescence and 100 offspring are produced. How many of the offspring would you expect to have oval fruit and simple inflorescence?
Red-green colorblindness in humans is X-linked recessive. A woman with normal colour vision whose father was colourblind marries a colourblind man.
What genotypes are possible for the mother of the colourblind man?
Red-green colorblindness in humans is X-linked recessive. A woman with normal colour vision whose father was colourblind marries a colourblind man.
What are the chances that the first child from this marriage will be a colourblind boy?
Red-green colorblindness in humans is X-linked recessive. A woman with normal colour vision whose father was colourblind marries a colourblind man.
Of all the girls produced by these parents, what proportion can be expected to be colourblind?
Red-green colorblindness in humans is X-linked recessive. A woman with normal colour vision whose father was colourblind marries a colourblind man.
Of all the children (sex unspecified) of these parents, what proportion can be expected to have normal colour vision?
In the Australian sheep blowfly an autosomal gene yellow (alleles Y, y+) determines the recessive phenotype yellow eyes. A pure breeding strain with yellow eyes is crossed to a pure breeding wild-type strain. The F1 flies from this cross are allowed to interbreed to produce the F2 generation.
What will be the phenotype of the F1 flies?
Yy+
yellow eyes
recessive
wild-type
In the Australian sheep blowfly an autosomal gene yellow (alleles Y, y+) determines the recessive phenotype yellow eyes. A pure breeding strain with yellow eyes is crossed to a pure breeding wild-type strain. The F1 flies from this cross are allowed to interbreed to produce the F2 generation.
The F1 flies are testcrossed, the phenotypic ratio of the offspring of the testcross is expected to be
3 wild-type : 1 yellow eye
3 yellow eye : 1 wild-type
1 wild-type : 1 yellow eye
All wild-type
QQRrssTtUUVv x qqRRsSTtUuVV
What is the probability of getting QqRrSsTtUuVv?
