Một đoạn ADN có tổng số 1500 nuclêôtit loại A là 3000 nuclêôtit . Hãy xác định A) số nuclêôtit mỗi loại của đoạn ADN
B) Số liên kết hiđro của đoạn ADN

Could someone me with number one you

6. in domesticated cats, the following are independently assorting: normal ears (t) is dominant to tufted ears (t); curved whiskers (c) is dominant to straight whiskers (c); the presence of six toes (s) is dominant to five toes (s); gene for hair length is an x-linked codominant. the three phenotypes for hair length are long (xhxh), medium (xhxh), and short (xhxh); medium is the heterozygous condition. given two parents: ttccssxhxh x ttccssxhy how many different gametes could be formed in the female cat with respect to these four traits? how many phenotypes are possible in the offspring from this mating?

When analyzing tree rings, what do scientists assume a thin ring indicates?