Genetic crosses and Punnett squares
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-LS3-2, NGSS.HS-LS3-3 · England: KS4 Combined Science: Evolution, inheritance and variation
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Date
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Question 1
What is a phenotype?
- A. a type of cell division
- B. the alleles an organism has, such as Bb
- C. a chromosome
- D. the characteristic that is shown, such as eye colour
Question 2
Two Bb parents have 200 offspring. Brown fur is dominant. About how many offspring would you expect to have white fur?
Answer
Question 3
Round seeds (R) is dominant over wrinkled seeds (r). Two parents with genotypes Rr and Rr are crossed. What percentage of the offspring are expected to have round seeds?
Answer%
Question 4
What does "heterozygous" mean?
- A. having no alleles
- B. having four alleles
- C. having two identical alleles, such as BB
- D. having two different alleles of a gene, such as Bb
Question 5
Two Pp parents have 400 offspring. Purple flowers is dominant. About how many offspring would you expect to have white flowers?
Answer
Question 6
Purple flowers (P) is dominant over white flowers (p). Two parents with genotypes Pp and Pp are crossed. What percentage of the offspring are expected to have white flowers?
Answer%
Question 7
A recessive characteristic only shows when…
- A. there is a dominant allele
- B. there are two recessive alleles
- C. there is one recessive allele
- D. the organism is old
Question 8
Two Rr parents have 120 offspring. Round seeds is dominant. About how many offspring would you expect to have wrinkled seeds?
Answer
Question 9
Brown fur (B) is dominant over white fur (b). Two parents with genotypes BB and Bb are crossed. What percentage of the offspring are expected to have white fur?
Answer%
Question 10
What is a phenotype?
- A. the characteristic that is shown, such as eye colour
- B. the alleles an organism has, such as Bb
- C. a chromosome
- D. a type of cell division
Question 11
Two Tt parents have 40 offspring. Tall stems is dominant. About how many offspring would you expect to have short stems?
Answer
Question 12
Purple flowers (P) is dominant over white flowers (p). Two parents with genotypes Pp and pp are crossed. What percentage of the offspring are expected to have white flowers?
Answer%
Question 13
In humans, which pair of sex chromosomes does a typical male have?
- A. XXY only
- B. XY
- C. XX
- D. YY
Question 14
Two Bb parents have 100 offspring. Brown fur is dominant. About how many offspring would you expect to have white fur?
Answer
Question 15
Round seeds (R) is dominant over wrinkled seeds (r). Two parents with genotypes Rr and Rr are crossed. What percentage of the offspring are expected to have wrinkled seeds?
Answer%
Question 16
A recessive characteristic only shows when…
- A. the organism is old
- B. there is a dominant allele
- C. there is one recessive allele
- D. there are two recessive alleles
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