Zadanie 7a
Using a Punnett grid, deduce the probability that one of their children inherits the disorder.
Sex chromosomes and inherited traits
Explain typical human chromosomal sex determination and the unequal gene content of X and Y chromosomes.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2022–2025.
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Zadanie 6a
Outline the usual chromosomal determination of sex in humans.
- Materiał graficzny
Zadanie 31
In a model insect, females are XX and males XO. A normal-looking male carries a newly induced recessive allele on his X in the germ line. He mates with a female homozygous for the normal allele. F1 females then mate with normal XO males. In which listed group…
Zadanie 12
This pedigree tracks a fully penetrant X-linked recessive condition. Assume no new mutations. Which statement about the family is supported? A. I-1 must carry the allele without expressing it B. III-1 proves that an affected male cannot reach adulthood C.…
- Materiał graficzny
Zadanie 4b
(i) State the chromosome number in a gamete. (ii) State the number of autosomes in a somatic cell.
Zadanie 24
Which event normally initiates testis differentiation in an XY human embryo? A. The first adult menstrual cycle B. Expression of a gene on the Y chromosome that initiates testis development C. Adrenaline release during exercise D. The final release of an egg…
Zadanie 11
Which statement correctly describes chromosome content in a typical mature human egg? A. It contains 44 autosomes and no sex chromosome B. It contains 23 pairs of autosomes C. It contains 22 autosomes and one X chromosome D. It contains one Y chromosome and…